Effects of Mechanical Transplanting Density on Yield of Nangeng 9108 and Soil Nutrients in Northern Jiangsu Province
As the dominant production area of geng rice in Jiangsu Province,an appropriate rice mechanical transplanting density is an important guarantee for achieving stable rice yield in the north of Jiangsu Province.In this study,the effects of different mechanical transplanting densities on rice yield and soil nutrients were investigated through a field experiment with fixed rice planting row and plant spacing(25 cm and 12 cm)and different numbers of seedlings per hole[2 seedlings/hole(D1),3 seedlings/hole(D2),4 seedlings/hole(D3),5 seedlings/hole(D4)and 6 seedlings/hole(D5)].The results showed that with the increase of the number of seedlings per hole,the number of panicles,the number of grains per panicle and the actual yield of rice showed an increasing and then decreasing trend.with the number of grains and the actual yield of D3 being the highest,which increased by 6.30％and 5.05％,respectively,compared to the conventional mechanical transplanting density of D4.In terms of soil nutrients,the application of rice at a row-plant spacing of 25 cm × 12 cm and a density of 5 or 6 seedlings per hole resulted in a reduction in soil total nitrogen,available phosphorus and available potassium.Compared with D4,the soil total nitrogen,nitrate nitrogen and available phosphorus contents of D3 increased significantly by 5.75％,39.04％and 38.82％respectively.In terms of yield compensatory effect,D3 had the highest yield compensation effect of 5.05％.In conclusion,the row-plant spacing of 25 cm x 12 cm combined with the machine planting density of 4 seedlings/hole can be a feasible measure for the green and stable yield of rice in northern Jiangsu Province.
万方数据
维普
