Evaluation of the response of crop yield to controlled release urea and the crucial influencing factors
The application of controlled release urea has been recognized as an efficient measure to improve crop yield relative to conventional urea.However,the crucial factors influencing the crop yield response to controlled release urea relative to conventional urea are still unclear.In this study,the response of crop yield to controlled release urea and the crucial influencing factors were evaluated based on the collected data(494 pairwise observations for crop yield)with a Meta-analysis.Controlled release urea increased crop yield by 5.0%over conventional urea.According to subgroup analysis,controlled release urea increased crop yield by 6.1%compared to conventional urea in loam texture soil,but did not affect crop yield in sand(-0.1%)or clay(1.8%)texture soils.Controlled release urea showed a greater increase in crop yield under medium season rainfall(7.9%),relative to low(3.8%)and high season rainfalls(3.1%).In addition,the yield response to controlled release urea increased with increasing soil pH and season mean temperature,whereas it gradually decreased with increasing soil total nitrogen and nitrogen fertilizer rates.Moreover,the combined application of controlled release urea and conventional urea(11.2%),rainfed system(6.9%),maize season(10.7%),and controlled release urea broadcast+tillage(8.1%)greatly enhanced the yield response relative to the single application of controlled release urea(3.9%),irrigated system(3.1%),wheat and rice seasons(0.6%-4.0%),and other controlled release urea fertilization methods(3.3%-4.3%)(P＜0.05),respectively.Overall,the application of controlled release urea was a good option to enhance crop yield in agriculture production,and the site-specific environmental factors and management practices should be considered when applying controlled release urea to increase crop yield.
NETL
NSTL
万方数据
