Abstract
This investigation aims to provide theoretical and practical evidence for the efficient utilization of nitrogen (N) in paddy-upland rapeseed-rice rotation systems because a lack of previous research on such rotation systems leads to inefficient management practices. The effects of the N application rates and the N fertilizer management strategies for rapeseed and rice were examined, respectively, in relation to the photosynthetic productivity and yields of hybrid rice. The results indicated that the leaf area, Pn, with 40% as basal fertilizer, 40% as tillering fertilize, and 20% as panicle fertilizer and a reduced N rate (30 kg/ha) during the rape season, were higher than other nitrogen management strategies trialed, with conventional N rates in the rape season. The average rice grain yield (9545.15 kg/ha) over the two years with 40% as basal fertilizer, 40% as tillering fertilizer, and 20% as panicle fertilizer was higher than other N treatments with the reduced N rates during the rape season. The reduced N rate during the rapeseed season and 40% as basal fertilizer, 40% as tillering fertilizer, and 20% as panicle fertilizer management during the rice season for the rape-rice rotation system exhibited the highest rice yields. Our findings indicated that the N fertilizer management model was a high-yielding, N-saving, and environmentally friendly measure for rape–rice rotation systems in southern China.
Highlights
China has the world’s largest population, but insufficient cultivated land resources to meet the required needs of its people
Over 90% of the plant biomass is derived from photosynthetic assimilations, which control the plant yield characteristics [18]
Similar to other external factors, such as light intensity, plant density, temperature, and CO2 conditions, that drastically affect the physiological processes in plants, due to their roles in regulating the carboxylation efficiency and electron transport capacity in photosynthesis [19,20], the nitrogen supply levels act as a critical factor in the regulation of leaf area expansion, photosynthesis efficiency, and leaf senescence [21,22]
Summary
China has the world’s largest population, but insufficient cultivated land resources to meet the required needs of its people. Increasing grain crop yields in China is a central strategy being utilized to address this problem. Diversified crop rotations regularly enhance grain crop yields by 10% or more, relative to simple rotations, and they have previously been widely utilized in agricultural systems [2]. Rice is a staple food in China as it is the major grain crop, and its per unit yield is more than 65% higher than the world average level.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
