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Rational Phosphorus Application Facilitates the Sustainability of the Wheat/Maize/Soybean Relay Strip Intercropping System.

Chen Y, Zhou T, Zhang C, Wang K, Liu J, Lu J, Xu K - PLoS ONE (2015)

Bottom Line: With P application rates increasing, the W/M/S system decreased the PRE from 35.9% to 12.3% averaged over the three years.A rational P application rate, 72 kg P ha-1, or an appropriate soil Olsen-P level, 19.1 mg kg-1, drives the W/M/S system to maximize total grain yield while minimizing P surplus, as a result of the PRE up to 28.0%.We conclude that rational P application is an important approach for relay intercropping to produce high yield while mitigating P pollution and the rational P application-based integrated P fertilizer management is vital for sustainable intensification of agriculture in the Southwest of China.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Nutrition and Microbiology, College of Resource Science, Sichuan Agricultural University, Chengdu, China.

ABSTRACT
Wheat (Triticum aestivum L.)/maize (Zea mays L.)/soybean (Glycine max L.) relay strip intercropping (W/M/S) system is commonly used by the smallholders in the Southwest of China. However, little known is how to manage phosphorus (P) to enhance P use efficiency of the W/M/S system and to mitigate P leaching that is a major source of pollution. Field experiments were carried out in 2011, 2012, and 2013 to test the impact of five P application rates on yield and P use efficiency of the W/M/S system. The study measured grain yield, shoot P uptake, apparent P recovery efficiency (PRE) and soil P content. A linear-plateau model was used to determine the critical P rate that maximizes gains in the indexes of system productivity. The results show that increase in P application rates aggrandized shoot P uptake and crops yields at threshold rates of 70 and 71.5 kg P ha-1 respectively. With P application rates increasing, the W/M/S system decreased the PRE from 35.9% to 12.3% averaged over the three years. A rational P application rate, 72 kg P ha-1, or an appropriate soil Olsen-P level, 19.1 mg kg-1, drives the W/M/S system to maximize total grain yield while minimizing P surplus, as a result of the PRE up to 28.0%. We conclude that rational P application is an important approach for relay intercropping to produce high yield while mitigating P pollution and the rational P application-based integrated P fertilizer management is vital for sustainable intensification of agriculture in the Southwest of China.

No MeSH data available.


Shoot P uptake as affected by P application rates in 2011, 2012 and 2013.A, Wheat; B, Maize, C Wheat-soybean strip; D, W/M/S system. Each data point was the mean of four replicates.
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pone.0141725.g006: Shoot P uptake as affected by P application rates in 2011, 2012 and 2013.A, Wheat; B, Maize, C Wheat-soybean strip; D, W/M/S system. Each data point was the mean of four replicates.

Mentions: Increase in P application rate increased shoot P uptake, but a changing point was observed in the relationship between P application rate and shoot P uptake (Fig 6). The plateau shoot P uptake of the W/M/S system was 71.82 kg P ha-1 and the critical application rate was 70 kg P ha-1 (Fig 6). Regarding each component of the W/M/S, the critical P application rates for wheat, maize and wheat-soybean strips were 49.7, 29.5, and 45.0 kg P ha-1 respectively. The plateau shoot P uptakes for wheat, maize and wheat-soybean strips were 36.82, 22.64, and 48.67 kg ha-1 respectively.


Rational Phosphorus Application Facilitates the Sustainability of the Wheat/Maize/Soybean Relay Strip Intercropping System.

Chen Y, Zhou T, Zhang C, Wang K, Liu J, Lu J, Xu K - PLoS ONE (2015)

Shoot P uptake as affected by P application rates in 2011, 2012 and 2013.A, Wheat; B, Maize, C Wheat-soybean strip; D, W/M/S system. Each data point was the mean of four replicates.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4634977&req=5

pone.0141725.g006: Shoot P uptake as affected by P application rates in 2011, 2012 and 2013.A, Wheat; B, Maize, C Wheat-soybean strip; D, W/M/S system. Each data point was the mean of four replicates.
Mentions: Increase in P application rate increased shoot P uptake, but a changing point was observed in the relationship between P application rate and shoot P uptake (Fig 6). The plateau shoot P uptake of the W/M/S system was 71.82 kg P ha-1 and the critical application rate was 70 kg P ha-1 (Fig 6). Regarding each component of the W/M/S, the critical P application rates for wheat, maize and wheat-soybean strips were 49.7, 29.5, and 45.0 kg P ha-1 respectively. The plateau shoot P uptakes for wheat, maize and wheat-soybean strips were 36.82, 22.64, and 48.67 kg ha-1 respectively.

Bottom Line: With P application rates increasing, the W/M/S system decreased the PRE from 35.9% to 12.3% averaged over the three years.A rational P application rate, 72 kg P ha-1, or an appropriate soil Olsen-P level, 19.1 mg kg-1, drives the W/M/S system to maximize total grain yield while minimizing P surplus, as a result of the PRE up to 28.0%.We conclude that rational P application is an important approach for relay intercropping to produce high yield while mitigating P pollution and the rational P application-based integrated P fertilizer management is vital for sustainable intensification of agriculture in the Southwest of China.

View Article: PubMed Central - PubMed

Affiliation: Department of Plant Nutrition and Microbiology, College of Resource Science, Sichuan Agricultural University, Chengdu, China.

ABSTRACT
Wheat (Triticum aestivum L.)/maize (Zea mays L.)/soybean (Glycine max L.) relay strip intercropping (W/M/S) system is commonly used by the smallholders in the Southwest of China. However, little known is how to manage phosphorus (P) to enhance P use efficiency of the W/M/S system and to mitigate P leaching that is a major source of pollution. Field experiments were carried out in 2011, 2012, and 2013 to test the impact of five P application rates on yield and P use efficiency of the W/M/S system. The study measured grain yield, shoot P uptake, apparent P recovery efficiency (PRE) and soil P content. A linear-plateau model was used to determine the critical P rate that maximizes gains in the indexes of system productivity. The results show that increase in P application rates aggrandized shoot P uptake and crops yields at threshold rates of 70 and 71.5 kg P ha-1 respectively. With P application rates increasing, the W/M/S system decreased the PRE from 35.9% to 12.3% averaged over the three years. A rational P application rate, 72 kg P ha-1, or an appropriate soil Olsen-P level, 19.1 mg kg-1, drives the W/M/S system to maximize total grain yield while minimizing P surplus, as a result of the PRE up to 28.0%. We conclude that rational P application is an important approach for relay intercropping to produce high yield while mitigating P pollution and the rational P application-based integrated P fertilizer management is vital for sustainable intensification of agriculture in the Southwest of China.

No MeSH data available.