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Gerardo Rubio - One of the best experts on this subject based on the ideXlab platform.
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long term phosphorus fertilization of wheat soybean and maize on mollisols Soil Test trends critical levels and balances
European Journal of Agronomy, 2018Co-Authors: Florencia Sucunza, Fernando O. Garcia, Flavio Gutierrez H Boem, Miguel Boxler, Gerardo RubioAbstract:Abstract Few reports have compared the P critical level between different crops under equivalent growing conditions and the impact of P balance and P fertilization practices on the long term dynamics of Soil available P. The objectives of this study were: i) to determine and compare, under similar field conditions, the P critical values for soybean, maize and wheat; and ii) to evaluate the effect of long-term application of P fertilizer on P balance and Soil-Test P. Results from a long-term experiment (2000/01 and 2013/14) involving soybean, maize and wheat crops in five experimental sites located at the Pampean Region (Argentina) were analyzed. Phosphorus levels included a −P treatment without P application and a +P treatment with continuous P fertilization (annual average 37 kg P ha−1). The critical Bray-P thresholds were 14.3, 12.5 and 19 mg kg−1 for soybean, maize and wheat, respectively. The rate of decline of the Bray-P pool in the −P treatments was described by an exponential decay function common to the five study sites. Obtained results indicated that a net extraction of 327 kg P per hectare is needed to reduce their initial Bray-P values by half, regardless of the initial Soil Bray-P value. The Soils fertilized with P showed a significant and linear increase in Bray-P. It was possible to fit a single function after pooling the data of the five sites. This combined function indicated that 3.2 kg P ha−1 were necessary to increase Bray-P in 1 mg kg−1. Obtained data on crop P critical levels and rates at which Soil-Test P declines or increases according to the P balance constitutes a useful tool for sustainable use of P resources in Mollisols and related Soil units. They can help to monitor future changes of Soil P levels and to estimate the P demand of croplands.
Florencia Sucunza - One of the best experts on this subject based on the ideXlab platform.
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long term phosphorus fertilization of wheat soybean and maize on mollisols Soil Test trends critical levels and balances
European Journal of Agronomy, 2018Co-Authors: Florencia Sucunza, Fernando O. Garcia, Flavio Gutierrez H Boem, Miguel Boxler, Gerardo RubioAbstract:Abstract Few reports have compared the P critical level between different crops under equivalent growing conditions and the impact of P balance and P fertilization practices on the long term dynamics of Soil available P. The objectives of this study were: i) to determine and compare, under similar field conditions, the P critical values for soybean, maize and wheat; and ii) to evaluate the effect of long-term application of P fertilizer on P balance and Soil-Test P. Results from a long-term experiment (2000/01 and 2013/14) involving soybean, maize and wheat crops in five experimental sites located at the Pampean Region (Argentina) were analyzed. Phosphorus levels included a −P treatment without P application and a +P treatment with continuous P fertilization (annual average 37 kg P ha−1). The critical Bray-P thresholds were 14.3, 12.5 and 19 mg kg−1 for soybean, maize and wheat, respectively. The rate of decline of the Bray-P pool in the −P treatments was described by an exponential decay function common to the five study sites. Obtained results indicated that a net extraction of 327 kg P per hectare is needed to reduce their initial Bray-P values by half, regardless of the initial Soil Bray-P value. The Soils fertilized with P showed a significant and linear increase in Bray-P. It was possible to fit a single function after pooling the data of the five sites. This combined function indicated that 3.2 kg P ha−1 were necessary to increase Bray-P in 1 mg kg−1. Obtained data on crop P critical levels and rates at which Soil-Test P declines or increases according to the P balance constitutes a useful tool for sustainable use of P resources in Mollisols and related Soil units. They can help to monitor future changes of Soil P levels and to estimate the P demand of croplands.
R Santhi - One of the best experts on this subject based on the ideXlab platform.
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evaluation of Soil Test crop response based integrated plant nutrition system stcr ipns recommendations for transgenic cotton on inceptisol
Research on Crops, 2014Co-Authors: Praveena S Katharine, R Santhi, C N Chandrasekhar, S Maragatham, K M SellamuthuAbstract:Soil Test based fertilizer prescription equations (FPEs) were developed for desired yield target of transgenic cotton under Integrated Plant Nutrition System (IPNS) through drip fertigation on Vertic Ustropept of Tamil Nadu, south India. To validate the equations, an experiment was conducted on the same Soil series. The results revealed that the deviation recorded in the achievement of target aimed, was within the range of ±10% (90–110%) proving the validity of the FPEs. STCR treatments greatly influenced the growth and yield attributes of the crop and recorded significantly higher yield, response ratio (RR) and benefit-cost ratio (BCR) than blanket, farmer's practice and control. STCR-IPNS treatments performed better than STCR-NPK alone treatments. There was build-up of post-harvest Soil fertility in the STCR treatments. The treatment, STCR-IPNS for 4.0 t/ha of cotton proved its superiority over all other treatments in terms of yield, uptake, response ratio, BCR and quality parameters. This treatment recorded an yield increase of 62.4 and 65.6%, respectively, over blanket and farmer's practice. Therefore, it could be concluded that these FPEs could be made use of for prescribing Soil Test based fertilizer doses for transgenic cotton on Inceptisols under drip fertigation.
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Soil Test based integrated plant nutrition system for ashwagandha on inceptisols
Indian journal of agricultural research, 2012Co-Authors: S Saranya, R Santhi, K Appavu, K RajamaniAbstract:An experiment was conducted on Vertic Ustropept following Ramamoorthy's Inductive cum targeted yield model to elucidate the relationship between Soil Test values and response of ashwagandha (Withania somnifera (L.) Dunal) to added fertilizers under Integrated Plant Nutrition System (IPNS). Nutrient requirement and contribution from Soil, fertilizers and FYM were calculated. The percent contribution from Soil, fertilizer and FYM were 19.03, 31.30 and 23.14 for N; 20.26,17.30 and 6.38 for P2O5; 11.08, 62.53 and 30.39 for K2O. Fertilizer prescription equations were developed for ashwagandha and nomograms were formulated based on the equations for a range of Soil Test values and desired target yield under IPNS. Following IPNS practice (NPK+ FYM @12.5t ha−1), 40, 24 and 30 kg ha−1 of fertilizer N, P2O5 and K2O respectively, could be saved.
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integrated fertilizer prescriptions for beetroot through inductive cum targeted yield model on an alfisol
Communications in Soil Science and Plant Analysis, 2011Co-Authors: R Santhi, A Bhaskaran, R NatesanAbstract:Field experiments were conducted on a Typic Haplustalf Soil of Tamil Nadu by adopting the inductive cum targeted yield model, and fertilizer requirements were quantified for beetroot based on Soil Test and yield target. The basic parameters [nutrient requirement (NR) and contributions of nutrients from Soil (Cs), fertilizer (Cf), and vermicompost (Cvermi)] were computed from the field experimental data. Using these basic parameters, we developed fertilizer prescription equations under the integrated plant nutrition system (IPNS), and nomograms were formulated for the desired yield target of beetroot for a range of Soil Test values. The quantity of fertilizers that could be contributed by vermicompost at 5 t ha−1 was evaluated as 40, 21, and 30 kg nitrogen (N), phosphorus pentoxide (P2O5), and potassium oxide (K2O), respectively, when applied along with the NPK fertilizers as per Soil Test and desired yield target.
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Soil Test crop response correlation studies under integrated plant nutrition system for onion allium cepa l var aggregatum in inceptisols of tamil nadu
Journal of the Indian Society of Soil Science, 2002Co-Authors: R Santhi, R Natesan, G SelvakumariAbstract:Soil Test crop response correlation studies were conducted with onion (var. CO.4) under integrated plant nutrition system (STCR-IPNS) in Inceptisols of Tamil Nadu during 1998–99. Fertilizer adjustment equations under IPNS were formulated for onion following Ramamoorthy's inductive-cum-targeted yield model. The nutrient requirement for producing one quintal of fresh onion bulbs was found to be 0.375, 0.329 and 0.466 kg of N, P2O5 and K2O, respectively. The per cent contributions from Soil and fertilizer nutrients were found to be 14.13 and 38.28 for N, 35.33 and 56.61 for P2O5 and 14.33 and 70.03 for K2O respectively. Likewise, the per cent contributions from farmyard manure (FYM), and FYM plus Azospirillum (Azo) were 20.32 and 22.51 for N, 16.55 and 17.12 for P2O5 and 25.17 and 25.66 for K2O respectively. The per cent contribution of N from Azospirillum was found to be 22.38. The quantity of fertilizers that could be adjusted to the levels and sources of organic manures was evaluated to be 36, 15 and 27 kg ha−1 of N, P2O5 and K2O, respectively for fertilizers with FYM; 12 kg N ha−1 for fertilizers with Azospirillum and 52, 16 and 27 kg ha−1 of N, P2O5 and K2O, respectively for fertilizers with FYM plus Azospirillum.
Flavio Gutierrez H Boem - One of the best experts on this subject based on the ideXlab platform.
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long term phosphorus fertilization of wheat soybean and maize on mollisols Soil Test trends critical levels and balances
European Journal of Agronomy, 2018Co-Authors: Florencia Sucunza, Fernando O. Garcia, Flavio Gutierrez H Boem, Miguel Boxler, Gerardo RubioAbstract:Abstract Few reports have compared the P critical level between different crops under equivalent growing conditions and the impact of P balance and P fertilization practices on the long term dynamics of Soil available P. The objectives of this study were: i) to determine and compare, under similar field conditions, the P critical values for soybean, maize and wheat; and ii) to evaluate the effect of long-term application of P fertilizer on P balance and Soil-Test P. Results from a long-term experiment (2000/01 and 2013/14) involving soybean, maize and wheat crops in five experimental sites located at the Pampean Region (Argentina) were analyzed. Phosphorus levels included a −P treatment without P application and a +P treatment with continuous P fertilization (annual average 37 kg P ha−1). The critical Bray-P thresholds were 14.3, 12.5 and 19 mg kg−1 for soybean, maize and wheat, respectively. The rate of decline of the Bray-P pool in the −P treatments was described by an exponential decay function common to the five study sites. Obtained results indicated that a net extraction of 327 kg P per hectare is needed to reduce their initial Bray-P values by half, regardless of the initial Soil Bray-P value. The Soils fertilized with P showed a significant and linear increase in Bray-P. It was possible to fit a single function after pooling the data of the five sites. This combined function indicated that 3.2 kg P ha−1 were necessary to increase Bray-P in 1 mg kg−1. Obtained data on crop P critical levels and rates at which Soil-Test P declines or increases according to the P balance constitutes a useful tool for sustainable use of P resources in Mollisols and related Soil units. They can help to monitor future changes of Soil P levels and to estimate the P demand of croplands.
Miguel Boxler - One of the best experts on this subject based on the ideXlab platform.
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long term phosphorus fertilization of wheat soybean and maize on mollisols Soil Test trends critical levels and balances
European Journal of Agronomy, 2018Co-Authors: Florencia Sucunza, Fernando O. Garcia, Flavio Gutierrez H Boem, Miguel Boxler, Gerardo RubioAbstract:Abstract Few reports have compared the P critical level between different crops under equivalent growing conditions and the impact of P balance and P fertilization practices on the long term dynamics of Soil available P. The objectives of this study were: i) to determine and compare, under similar field conditions, the P critical values for soybean, maize and wheat; and ii) to evaluate the effect of long-term application of P fertilizer on P balance and Soil-Test P. Results from a long-term experiment (2000/01 and 2013/14) involving soybean, maize and wheat crops in five experimental sites located at the Pampean Region (Argentina) were analyzed. Phosphorus levels included a −P treatment without P application and a +P treatment with continuous P fertilization (annual average 37 kg P ha−1). The critical Bray-P thresholds were 14.3, 12.5 and 19 mg kg−1 for soybean, maize and wheat, respectively. The rate of decline of the Bray-P pool in the −P treatments was described by an exponential decay function common to the five study sites. Obtained results indicated that a net extraction of 327 kg P per hectare is needed to reduce their initial Bray-P values by half, regardless of the initial Soil Bray-P value. The Soils fertilized with P showed a significant and linear increase in Bray-P. It was possible to fit a single function after pooling the data of the five sites. This combined function indicated that 3.2 kg P ha−1 were necessary to increase Bray-P in 1 mg kg−1. Obtained data on crop P critical levels and rates at which Soil-Test P declines or increases according to the P balance constitutes a useful tool for sustainable use of P resources in Mollisols and related Soil units. They can help to monitor future changes of Soil P levels and to estimate the P demand of croplands.
