Effects of Long-term Combined Application of Organic and Inorganic Fertilizers on Nitrogen Uptake and Utilization in Rice
1st author: 1521812180@qq.com
Received date: 2021-07-08
Online published: 2021-11-20
Based on a 25-year location experiment, the effects of long-term combined application of organic and inorganic fertilizers on nitrogen absorption, utilization and yield of rice were studied. The results showed that, the total N accumulation and yield of rice aboveground were as follows: MNPK（100% chemical fertilizer+100% organic fertilizer）>1/4M+3/4NPK（25% organic fertilizer instead of chemical fertilizer）>NPK（conventional chemical fertilizer）>1/2M+1/2NPK（50% organic fertilizer instead of chemical fertilizer）>M （100% organic fertilizer instead of chemical fertilizer）>CK（no fertilization）, compared with NPK, MNPK treatment and 1/4M+3/4NPK treatment increased total nitrogen accumulation in shoot by 20.11%~27.86% and yield by 2.04%~12.42%. The contribution rate of N transport before anthesis （69.54%~84.60%） was significantly higher than that of N accumulation after anthesis （15.40%~30.46%）, and N accumulation before anthesis was the main source of N in rice plants. The partial productivity and nitrogen harvest index of 1/4M+3/4NPK treatment were higher than those of NPK treatment, which were increased by 16.42% and 10.29%, respectively. The combined application of organic and inorganic fertilizers significantly improved rice quality and increased the amino acid content of grains, the content of non-essential amino acids was about twice as much as that of essential amino acids. Under the long-term fertilization condition, 25% organic fertilizer instead of chemical fertilizer treatment, on the basis of reduced chemical fertilizer application, can improve the utilization rate of fertilizer and promote the absorption of rice nutrients, which is the best fertilization measure to achieve rice yield increase and quality improvement in the paddy soil area of yellow soil.
Shengling YANG, Xingcheng HUANG, Yanling LIU, Yu LI, Yan ZAHNG, Yarong ZHANG, Wenan ZAHNG, Taiming JIANG . Effects of Long-term Combined Application of Organic and Inorganic Fertilizers on Nitrogen Uptake and Utilization in Rice[J]. China Rice, 2021 , 27(6) : 63 -68 . DOI: 10.3969/j.issn.1006-8082.2021.06.013
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