Nitrogen-Reduction in Intensive Cultivation Improved Nitrogen Fertilizer Utilization Efficiency and Soil Nitrogen Mineralization of Double-Cropped Rice

Under the current rice cropping system, excessive nitrogen application has become a major issue that needs to be changed, and nitrogen reduction has become a hot research topic in recent years. The use of optimum planting density is becoming a common agronomic management system in addition to nitrog...

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Published in:Agronomy (Basel) 2022-05, Vol.12 (5), p.1103
Main Authors: Luo, Zhuo, Song, Haixing, Huang, Min, Zhang, Zhenhua, Peng, Zhi, Zi, Tao, Tian, Chang, Eissa, Mamdouh A.
Format: Article
Language:English
Subjects:
Agricultural production
Cereal crops
Crop yield
Cropping systems
Cultivars
Cultivation
dense planting
Double cropping
Efficiency
Environmental impact
Experiments
Fertilizers
Mineralization
Nitrogen
nitrogen reduction
nitrogen use efficiency
Planting
Planting density
Population
Potassium
Reduction
Rice
Rice fields
Seasons
Soil fertility
soil net mineralized nitrogen
Soils
yield
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Summary:Under the current rice cropping system, excessive nitrogen application has become a major issue that needs to be changed, and nitrogen reduction has become a hot research topic in recent years. The use of optimum planting density is becoming a common agronomic management system in addition to nitrogen reduction, especially under double cropping rice systems. In this paper, changes in rice yield, nitrogen-use efficiency (NUE) and net N mineralization under dense planting with a reduced nitrogen rate (DPRN) were studied. By comparing DPRN with high-nitrogen sparse planting (SPHN), we found that the population tiller number (tiller number per unit area) increased by 9–27% under DPRN cultivation. Nitrogen accumulation under DPRN treatment of double-cropped rice was basically stable. NUE under DPRN was significantly higher by 1.3–22.7% compared to SPHN. The partial factor productivity of applied N (PFPN) was significantly higher than that of SPHN, with an increase of 4.3–22.8%. The net N mineralized of double-cropped rice under DPRN increased at different stages, and the increase in late-season rice (LSR) was greater than that of early-season rice (ESR). The highest net N mineralized in double cropping rice at different stages was found in the dense planting treatment (DP) and N2 (120 kg N h−1). In conclusion, DPRN cultivation of double-cropped rice could be accepted as a proper management strategy for reducing nitrogen input, improving NUE and promoting soil nitrogen mineralization under given conditions.
ISSN:2073-4395
2073-4395
DOI:10.3390/agronomy12051103