Effect of straw return with nitrogen fertilizer on photosynthetic characteristics and yield of rice in soda saline–alkali rice paddy fields

Meng, Xiangyu; Ran, Cheng; Liu, Baolong; Zhao, Zhexuan; Bai, Tianqi; Zhao, Mingming; Cheng, Ziqiang; Chen, Guang; Geng, Yanqiu

doi:10.1007/s42976-022-00312-y

Cited by 8 publications

(1 citation statement)

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“…There have been many studies on the effects of nitrogen fertilizer on crop yield and starch quality. In rice, nitrogen application can improve rice yield by increasing SPAD and net photosynthetic rate of rice leaves, increasing panicle number, grain number and grain weight [ 13 , 14 ], and improving rice taste quality by increasing protein content, final viscosity and setback viscosity, and reducing peak viscosity and breakdown viscosity [ 15 , 16 ]. In maize, application of nitrogen at different stages could significantly increase protein content and yield in corn grain [ 17 , 18 ], while delayed application of nitrogen significantly has increased starch and protein content, improved corn grain quality, starch grain size and starch quality [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Slow-Release Fertilizer on Lotus Rhizome Yield and Starch Quality under Different Fertilization Periods

Zhu

Deng

et al. 2023

Plants

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Slow-release fertilizer is an environmentally friendly fertilizer that is widely used in crop cultivation instead of traditional nitrogen fertilizer. However, the optimal application time of slow-release fertilizer and its effect on starch accumulation and rhizome quality of lotus remains unclear. In this study, two slow-release fertilizer applications (sulfur-coated compound fertilizer, SCU, and resin-coated urea, RCU) were fertilized under three fertilization periods (the erect leaf stage, SCU1 and RCU1; the erect leaf completely covering the water stage, SCU2 and RCU2; and the swelling stage of lotus rhizomes, SCU3 and RCU3) to study the effects of different application periods. Compared with CK (0 kg∙ha−1 nitrogen fertilizer), leaf relative chlorophyll content (SPAD) and net photosynthetic rate (Pn) remained at higher levels under SCU1 and RCU1. Further studies showed that SCU1 and RCU1 increased yield, amylose content, amylopectin and total starch, and the number of starch particles in lotus, and also significantly reduced peak viscosity, final viscosity and setback viscosity of lotus rhizome starch. To account for these changes, we measured the activity of key enzymes in starch synthesis and the relative expression levels of related genes. Through analysis, we found that these parameters increased significantly under SCU and RCU treatment, especially under SCU1 and RCU1 treatment. The results of this study showed that the one-time application at the erect leaf stage (SCU1 and RCU1) could improve the physicochemical properties of starch by regulating the key enzymes and related genes of starch synthesis, thus improving the nutritional quality of lotus rhizome. These results provide a technical choice for the one-time application of slow-release fertilizer in lotus rhizome production and cultivation.

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