Effects of Interaction Between Nitrogen Application Level and Planting Density on Growth and Yield of Rice at Different Growth Stages

doi:10.7668/hbnxb.201751248

Abstract

Abstract: In view of the increase of nitrogen fertilizer application and decrease of planting density in rice production.The aim of the study was to explore the effects of nitrogen application rate and planting density on the growth,nutrient uptake and yield of rice,in order to provide a theoretical basis for reducing nitrogen application and high-efficiency fertilization.This experiment was carried out in rice field of Rencheng District,Jining City,Shandong Province,taking the second season rice Saint Rice 18 as the material,and setting up 4 nitrogen application rates:no nitrogen(N1)0 kg/ha,low nitrogen(N2)216 kg/ha,medium nitrogen(N3)288 kg/ha and high nitrogen(N4)360 kg/ha,and 3 planting densities:low density(240 000 plants/ha),medium density(270 000 plants/ha)and high density(300 000 plants/ha). A total of 12 treatments and 3 repetitions were arranged. The results showed that 30N3 was the best treatment for plant height,fresh weight,leaf area and tiller number at jointing stage. For rice nutrient uptake,the nitrogen content of rice under medium nitrogen and density was the highest,and 27N2 treatment was 20.2% higher than that of 24N2 treatment at heading stage,and 27N3 treatment was 1.30% higher than that of 27N1 treatment during grain filling period. The contents of total phosphorus and total potassium in rice increased with the increase of nitrogen application rate. The test also indicated that under medium density,the nitrogen application rate of 288 kg/ha was 12.1% higher than that of no nitrogen fertilizer. Under medium nitrogen condition,the planting density of 270 000 plants/ha was 18.5% higher than that of low-density treatment. The optimal combination of nitrogen fertilizer and density in this experiment was 288 kg/ha and 270 000 plants/ha. The combination reduced the amount of nitrogen fertilizer and controlled the reasonable density,and the yield was optimal(14 615.3 kg/ha).

Key words: Rice, Nitrogen application levels, Planting density, Growth index, Yield

CLC Number:

S147.3

LI Siping, DING Xiaodong, XIANG Dan, ZENG Lusheng, ZHANG Yuxiao, XIE Junrui, HUANG Xincheng, GAO Farui. Effects of Interaction Between Nitrogen Application Level and Planting Density on Growth and Yield of Rice at Different Growth Stages[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(4): 174-182. doi: 10.7668/hbnxb.201751248.

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