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Haijun Liu - One of the best experts on this subject based on the ideXlab platform.

  • responses of drip irrigated tomato solanum lycopersicum l yield quality and water productivity to various Soil Matric Potential thresholds in an arid region of northwest china
    Agricultural Water Management, 2013
    Co-Authors: Jianhua Zheng, Guanhua Huang, Dongdong Jia, Jun Wang, Mariana Mota, L S Pereira, Quanzhong Huang, Haijun Liu
    Abstract:

    Abstract Considering the current water scarcity of Northwest China, aiming at sustainable agricultural development in this region, it is required to identify and apply the most appropriate practices for water-saving, and yield and water productivity improvement. Relative to the tomato crop, a two-year field experiment was conducted in an arid region of Northwest China using drip irrigation and transparent plastic mulch to study the impacts of various Soil Matric Potential thresholds (−10, −20, −30, −40 and −50 kPa) on yields, fruit quality and water productivity. A Soil water balance was performed to estimate the seasonal actual ET (ETa) for every treatment and to relate it with the volume of water applied and yields achieved. Crop coefficients were determined from the crop density and height; for the non-stressed treatment the values of 0.30, 1.10 and 1.05 were obtained for the initial, mid-season and late season stages, respectively. A linear relationship between seasonal ETa and applied water was obtained. Tomato yields and ETa decreased with decreasing applied water but fruit quality did not: it was best under mild to moderate water stress (−30 to −40 kPa). Water productivity based on marketable-quality yields was the greatest when applied irrigation was 90% of the amount of irrigation required for no stress. This condition corresponds to a Soil Matric Potential threshold of −40 kPa. However, a smaller stress may be desired in terms of irrigation management and a threshold of −30 kPa is then recommended.

  • irrigation scheduling strategies based on Soil Matric Potential on yield and fruit quality of mulched drip irrigated chili pepper in northwest china
    Agricultural Water Management, 2012
    Co-Authors: Haijun Liu, Jianhua Zheng, Dongdong Jia, Jun Wang, Huiying Yang, Guanhua Huang
    Abstract:

    Abstract A two-year field experiment was conducted with drip irrigation and plastic mulch to investigate an appropriate irrigation management strategy for chili pepper (Capsicum annuum L.). Five treatments, with the Soil Matric Potential (SMP) threshold range of −10 to −50 kPa at intervals of 10 kPa, were applied in this study and are correspondingly referred to as T1 to T5. Leaf area index, plant height, Soil water content, yield, and total soluble solids (TSS) were measured, and seasonal crop evapotranspiration (ET), water productivity (WP), and irrigation water productivity (IWP) were computed regularly. Results showed that the differences in leaf area index, plant height, above-ground biomass, and crop yield in treatments T1 though T4 were similar (P > 0.05), but higher (P

  • Potato evapotranspiration and yield under different drip irrigation regimes
    Irrigation Science, 2004
    Co-Authors: Yaohu Kang, Feng Xin Wang, Haijun Liu, Bao-zhong Yuan
    Abstract:

    A field experiment comparing different irrigation frequencies and Soil Matric Potential thresholds on potato evapotranspiration (ET), yield (Y) and water-use efficiency (WUE) was carried out in a loam Soil. The experiment included five treatments for Soil Matric Potential: F1 (-15 kPa), F2 (-25 kPa), F3 (-35 kPa), F4 (-45 kPa) and F5 (-55 kPa) and six treatments for irrigation frequency: N1 (once every day), N2 (once every 2 days), N3 (once every 3 days), N4 (once every 4 days), N6 (once every 6 days) and N8 (once every 8 days). Results indicate that both Soil Matric Potential and drip irrigation frequency influenced potato ET, Y and WUE. Potato ET increased as irrigation frequency and Soil Matric Potential increased. Comparing Soil water Potential, the highest ET was 63.4 mm (32.1%) more than the lowest value. Based on irrigation frequency treatments, the highest ET was 36.7 mm (19.2%) more than the lowest value. Potato Y and WUE were also found to increase as irrigation frequency increased. Potato Y increased with an increase in Soil water Potential then started to decrease. The highest Y and WUE values were achieved with a Soil Matric Potential threshold of -25 kPa and an irrigation frequency of once a day.

Guanhua Huang - One of the best experts on this subject based on the ideXlab platform.

  • responses of drip irrigated tomato solanum lycopersicum l yield quality and water productivity to various Soil Matric Potential thresholds in an arid region of northwest china
    Agricultural Water Management, 2013
    Co-Authors: Jianhua Zheng, Guanhua Huang, Dongdong Jia, Jun Wang, Mariana Mota, L S Pereira, Quanzhong Huang, Haijun Liu
    Abstract:

    Abstract Considering the current water scarcity of Northwest China, aiming at sustainable agricultural development in this region, it is required to identify and apply the most appropriate practices for water-saving, and yield and water productivity improvement. Relative to the tomato crop, a two-year field experiment was conducted in an arid region of Northwest China using drip irrigation and transparent plastic mulch to study the impacts of various Soil Matric Potential thresholds (−10, −20, −30, −40 and −50 kPa) on yields, fruit quality and water productivity. A Soil water balance was performed to estimate the seasonal actual ET (ETa) for every treatment and to relate it with the volume of water applied and yields achieved. Crop coefficients were determined from the crop density and height; for the non-stressed treatment the values of 0.30, 1.10 and 1.05 were obtained for the initial, mid-season and late season stages, respectively. A linear relationship between seasonal ETa and applied water was obtained. Tomato yields and ETa decreased with decreasing applied water but fruit quality did not: it was best under mild to moderate water stress (−30 to −40 kPa). Water productivity based on marketable-quality yields was the greatest when applied irrigation was 90% of the amount of irrigation required for no stress. This condition corresponds to a Soil Matric Potential threshold of −40 kPa. However, a smaller stress may be desired in terms of irrigation management and a threshold of −30 kPa is then recommended.

  • irrigation scheduling strategies based on Soil Matric Potential on yield and fruit quality of mulched drip irrigated chili pepper in northwest china
    Agricultural Water Management, 2012
    Co-Authors: Haijun Liu, Jianhua Zheng, Dongdong Jia, Jun Wang, Huiying Yang, Guanhua Huang
    Abstract:

    Abstract A two-year field experiment was conducted with drip irrigation and plastic mulch to investigate an appropriate irrigation management strategy for chili pepper (Capsicum annuum L.). Five treatments, with the Soil Matric Potential (SMP) threshold range of −10 to −50 kPa at intervals of 10 kPa, were applied in this study and are correspondingly referred to as T1 to T5. Leaf area index, plant height, Soil water content, yield, and total soluble solids (TSS) were measured, and seasonal crop evapotranspiration (ET), water productivity (WP), and irrigation water productivity (IWP) were computed regularly. Results showed that the differences in leaf area index, plant height, above-ground biomass, and crop yield in treatments T1 though T4 were similar (P > 0.05), but higher (P

Jianhua Zheng - One of the best experts on this subject based on the ideXlab platform.

  • responses of drip irrigated tomato solanum lycopersicum l yield quality and water productivity to various Soil Matric Potential thresholds in an arid region of northwest china
    Agricultural Water Management, 2013
    Co-Authors: Jianhua Zheng, Guanhua Huang, Dongdong Jia, Jun Wang, Mariana Mota, L S Pereira, Quanzhong Huang, Haijun Liu
    Abstract:

    Abstract Considering the current water scarcity of Northwest China, aiming at sustainable agricultural development in this region, it is required to identify and apply the most appropriate practices for water-saving, and yield and water productivity improvement. Relative to the tomato crop, a two-year field experiment was conducted in an arid region of Northwest China using drip irrigation and transparent plastic mulch to study the impacts of various Soil Matric Potential thresholds (−10, −20, −30, −40 and −50 kPa) on yields, fruit quality and water productivity. A Soil water balance was performed to estimate the seasonal actual ET (ETa) for every treatment and to relate it with the volume of water applied and yields achieved. Crop coefficients were determined from the crop density and height; for the non-stressed treatment the values of 0.30, 1.10 and 1.05 were obtained for the initial, mid-season and late season stages, respectively. A linear relationship between seasonal ETa and applied water was obtained. Tomato yields and ETa decreased with decreasing applied water but fruit quality did not: it was best under mild to moderate water stress (−30 to −40 kPa). Water productivity based on marketable-quality yields was the greatest when applied irrigation was 90% of the amount of irrigation required for no stress. This condition corresponds to a Soil Matric Potential threshold of −40 kPa. However, a smaller stress may be desired in terms of irrigation management and a threshold of −30 kPa is then recommended.

  • irrigation scheduling strategies based on Soil Matric Potential on yield and fruit quality of mulched drip irrigated chili pepper in northwest china
    Agricultural Water Management, 2012
    Co-Authors: Haijun Liu, Jianhua Zheng, Dongdong Jia, Jun Wang, Huiying Yang, Guanhua Huang
    Abstract:

    Abstract A two-year field experiment was conducted with drip irrigation and plastic mulch to investigate an appropriate irrigation management strategy for chili pepper (Capsicum annuum L.). Five treatments, with the Soil Matric Potential (SMP) threshold range of −10 to −50 kPa at intervals of 10 kPa, were applied in this study and are correspondingly referred to as T1 to T5. Leaf area index, plant height, Soil water content, yield, and total soluble solids (TSS) were measured, and seasonal crop evapotranspiration (ET), water productivity (WP), and irrigation water productivity (IWP) were computed regularly. Results showed that the differences in leaf area index, plant height, above-ground biomass, and crop yield in treatments T1 though T4 were similar (P > 0.05), but higher (P

Yaohu Kang - One of the best experts on this subject based on the ideXlab platform.

  • Integrated use of saline water and rootzone Matric Potential control for saline Soil reclamation and shrub growth
    2021
    Co-Authors: Chen Zhang, Yaohu Kang
    Abstract:

    A four-year field experiment was carried out to evaluate an integrated use of saline water for the saline Soil reclamation in Hebei Province of North China. A landscape shrub (Caryopteris × clandonensis ‘Worcester Gold’) was cultivated using drip irrigation scheduled by rootzone Soil Matric Potential control at five levels of water salinity (ECi): 0.8, 3.1, 4.7, 6.3, and 7.8 dS·m−1. Soil Matric Potential control was applied using a threshold of −5, −10, −15, and −20 kPa in the first, second, third, and fourth year, respectively. After four growing seasons, the saline Soil (initial ECe value of 27.8 dS·m−1) was reclaimed to slightly saline Soil for 0–1 m depth (4.1–7.2 dS·m−1) under drip irrigation with saline water of ECi 50%, the threshold salinity of irrigation water for ‘Worcester Gold’ cultivation was 7.8, 7.0, 5.6, and 5.3 dS·m–1, for the first, second, third, and fourth growing season, respectively. It is recommended to use an inter-seasonal evolving Matric Potential threshold of −10 kPa for dry season of the third year, −15 kPa for rainy season of the third year and dry season of the fourth year, and −20 kPa for rainy season of the fourth year.

  • Effects of different irrigation methods on micro-environments and root distribution in winter wheat fields
    Journal of Integrative Agriculture, 2015
    Co-Authors: Ji-qing Song, Wen-bo Bai, Yuan Liu, Yaohu Kang
    Abstract:

    The irrigation method used in winter wheat fields affects micro-environment factors, such as relative humidity (RH) within canopy, Soil temperature, topSoil bulk density, Soil Matric Potential, and Soil nutrients, and these changes may affect plant root growth. An experiment was carried out to explore the effects of irrigation method on micro-environments and root distribution in a winter wheat field in the 2007–2008 and 2008–2009 growing seasons. The results showed that border irrigation (BI), sprinkler irrigation (SI), and surface drip irrigation (SDI) had no significant effects on Soil temperature. TopSoil bulk density, RH within the canopy, Soil available N distribution, and Soil Matric Potential were significantly affected by the three treatments. The change in Soil Matric Potential was the key reason for the altered root profile distribution patterns. Additionally, more fine roots were produced in the BI treatment when Soil water content was low and topSoil bulk density was high. Root growth was most stimulated in the top Soil layers and inhibited in the deep layers in the SDI treatment, followed by SI and BI, which was due to the different water application frequencies. As a result, the root profile distribution differed, depending on the irrigation method used. The root distribution pattern changes could be described by the power level variation in the exponential function. A good knowledge of root distribution patterns is important when attempting to model water and nutrient movements and when studying Soil-plant interactions.

  • Effect of Soil Matric Potential on wolfberry (Lycium barbarbum L.) yield, evapotranspiration and water use efficiency under drip irrigation
    2013
    Co-Authors: Junshu Jia, Yaohu Kang, Shuqin Wan
    Abstract:

    The experiment was undertaken in order to investigate the effect of Soil Matric Potential (SMP) on wolfberry yield, evapotranspiration (ET), water use efficiency (WUE) and the implications for Soil water management under drip irrigation in the Yinchuan Plain arid region of Northwest China. The experiment consisted of five treatments, which maintained SMP at a depth of 0.2 m immediately under a drip emitter releasing water at -10 (S1), -20 (S2), -30 (S3), -40 (S4) and -50 kPa (S5), respectively, after wolfberry had been planted. The results showed that during the growing season, the target SMP value of the five different treatments was maintained within the experimental design range and the irrigation volume and ET declined as the target SMP value decreased. The temporal and spatial Soil water content (SWC) changes observed in the Soil profile suggested that the S1 and S2 treatments could meet the crop water absorption demand because the Soil moisture was over 15 % and Soil water was in excess of crop needs. However, the Soil water content for S3, S4 and S5 was less than 15 %, which produced visible water stress in the crop. Statistical analysis for the change values in the electrical conductivity of the saturated Soil-paste extract (ECe) showed the significant differences between the different SMP treatments in the middle layer (40 – 80 cm) and the plots S2 (-20 kPa) had the better effect of the Soil salinity leached. The highest yield was achieved in the S2 plots and the lowest fresh to dry weight ratio was found in the S3 plots, which also produced the highest quality seed. WUE was in the order S3 > S5 > S2 > S4 > S1. Based on a comprehensive analysis that included irrigation volume, ET value, crop yield and WUE, it is recommended that the SMP threshold should be controlled in the range from -20 to -30 kPa, which was the most favorable drip irrigation schedule for increasing yields and irrigation efficiency. The study should provide information that could be used in other regions suffering from drought and water scarcity.

  • effect of Soil Matric Potential on tomato yield and water use under drip irrigation condition
    Agricultural Water Management, 2007
    Co-Authors: Dan Wang, Yaohu Kang, Shuqin Wan
    Abstract:

    Abstract Field experiment was carried out to investigate the effect of Soil Matric Potential (SMP) on tomato yield, evapotranspiration (ET), water use efficiency (WUE) and irrigation water use efficiency (IWUE) under drip irrigation condition in North China Plain. The experiment included five treatments, which controlled SMP at 0.2 m depth immediately under drip emitter higher than −10 (S1), −20 (S2), −30 (S3), −40 (S4) and −50 kPa (S5), respectively, after tomato plant establishment. The results showed that different SMP affected irrigation amount and tomato ET. Irrigation amount decreased from 185 mm (S1) to 83.6 mm (S5) in 2004, and from 165 mm (S1) to 109 mm (S5) in 2005, respectively. The ET decreased from 270 mm (S1) to 202 mm (S5) in both years. However, it was found that SMP did not affect the tomato yield significantly, for the range of SMP investigated. Both WUE and IWUE increased as SMP decreased. The maximum WUE (253 and 217 kg/ha mm) and IWUE (620 and 406 kg/ha mm) were for S5 in 2 years, whereas the minimum WUE (178 and 155 kg/ha mm) and IWUE 261 and 259 kg/ha mm) were for S1 in 2004 and 2005. Based on the above results, therefore, it is recommended that if the tomatoes are well irrigated (SMP is higher than −20 kPa) during establishment, controlling SMP higher than −50 kPa at 0.2 m depth immediately under drip emitter can be used as an indicator for drip irrigation scheduling during following period of tomato growth in North China Plain.

  • Effects of Soil Matric Potential on potato growth under drip irrigation in the North China Plain
    Agricultural Water Management, 2007
    Co-Authors: Feng Xin Wang, Shi Ping Liu, Yaohu Kang, Xiao Yan Hou
    Abstract:

    This research examines the affect of five Soil Matric Potential (SMP) treatments [F1 (-15 kPa), F2 (-25 kPa), F3 (-35 kPa), F4 (-45 kPa), F5 (-55 kPa)] under drip irrigation conditions conducted in the North China Plain. The temporal and spatial SMP changes observed in the Soil profile along with changes in potato root growth suggest that tensiometers placed immediately beneath the emitter (at 20 cm) can be effectively used in scheduling the drip irrigation regimen. Although rain affected Soil water distribution during the growing season, the affects of SMP on potato growth were very clear. Crop evapotranspiration was highest for F2, decreasing thereafter to F1, F3, F4, and F5. Other potato growth properties such as crop height, leaf and stem water content, tuber bulk rate and grade, as well as WUE (water use efficiency) and IWUE (irrigation water use efficiency) suggest that an SMP of -25 kPa was the most favorable setting for potato production, while -15 kPa was too high and -45 kPa lead to severe water stress. © 2006.

Jun Wang - One of the best experts on this subject based on the ideXlab platform.

  • responses of drip irrigated tomato solanum lycopersicum l yield quality and water productivity to various Soil Matric Potential thresholds in an arid region of northwest china
    Agricultural Water Management, 2013
    Co-Authors: Jianhua Zheng, Guanhua Huang, Dongdong Jia, Jun Wang, Mariana Mota, L S Pereira, Quanzhong Huang, Haijun Liu
    Abstract:

    Abstract Considering the current water scarcity of Northwest China, aiming at sustainable agricultural development in this region, it is required to identify and apply the most appropriate practices for water-saving, and yield and water productivity improvement. Relative to the tomato crop, a two-year field experiment was conducted in an arid region of Northwest China using drip irrigation and transparent plastic mulch to study the impacts of various Soil Matric Potential thresholds (−10, −20, −30, −40 and −50 kPa) on yields, fruit quality and water productivity. A Soil water balance was performed to estimate the seasonal actual ET (ETa) for every treatment and to relate it with the volume of water applied and yields achieved. Crop coefficients were determined from the crop density and height; for the non-stressed treatment the values of 0.30, 1.10 and 1.05 were obtained for the initial, mid-season and late season stages, respectively. A linear relationship between seasonal ETa and applied water was obtained. Tomato yields and ETa decreased with decreasing applied water but fruit quality did not: it was best under mild to moderate water stress (−30 to −40 kPa). Water productivity based on marketable-quality yields was the greatest when applied irrigation was 90% of the amount of irrigation required for no stress. This condition corresponds to a Soil Matric Potential threshold of −40 kPa. However, a smaller stress may be desired in terms of irrigation management and a threshold of −30 kPa is then recommended.

  • irrigation scheduling strategies based on Soil Matric Potential on yield and fruit quality of mulched drip irrigated chili pepper in northwest china
    Agricultural Water Management, 2012
    Co-Authors: Haijun Liu, Jianhua Zheng, Dongdong Jia, Jun Wang, Huiying Yang, Guanhua Huang
    Abstract:

    Abstract A two-year field experiment was conducted with drip irrigation and plastic mulch to investigate an appropriate irrigation management strategy for chili pepper (Capsicum annuum L.). Five treatments, with the Soil Matric Potential (SMP) threshold range of −10 to −50 kPa at intervals of 10 kPa, were applied in this study and are correspondingly referred to as T1 to T5. Leaf area index, plant height, Soil water content, yield, and total soluble solids (TSS) were measured, and seasonal crop evapotranspiration (ET), water productivity (WP), and irrigation water productivity (IWP) were computed regularly. Results showed that the differences in leaf area index, plant height, above-ground biomass, and crop yield in treatments T1 though T4 were similar (P > 0.05), but higher (P