Effects of Dense Planting with Reduced Nitrogen Input Cultivation on the Grain Quality of Hybrid Indica Rice
The study took four hybrid indica rice varieties(Y Liangyou 900,Liangyoupeijiu,Luoyou10,and Chuanyou 6203)as materials,and set three nitrogen fertilizer rate of 0(N1),90(N2)and 180 kg/ha N(N3),and two planting density of 22.2(D1)and 33.3 plants/m2(D2)under field conditions to study the effects of dense planting with reduced nitrogen input practice on grain quality in rice.The results showed that the yield of Liangyoupeijiu,Luoyou10,and Chuanyou 6203 under dense planting with reduced nitrogen input practice(N2D2)increased by 10.0％,9.2％and 7.6％,respectively,compared with that under normal nitrogen and normal density treatment(N3D1),while the yield of Y Liangyou 900 was not significantly different between the two treatments.Dense planting with reduced nitrogen input practice significantly decreased the milling quality,and the head rice rate reduced by 15.3％,while the appearance quality was improved in N2D2,and chalkiness degree and chalky grain percentage were reduced by 26.9％and 9.7％,respectively.At the same time,amylose content and total protein content were decreased by 6.2％and 21.9％in N2D2,compared with that in N3D1,respectively.In addition,dense planting with reduced nitrogen input practice increased the peak viscosity,hot viscosity,final viscosity and breakdown value,but decreased the setback.In conclusion,the effects of dense planting with reduced nitrogen input practice on rice yield and quality were significantly different between varieties and between years.On the whole,dense planting with reduced nitrogen input practice improved the appearance and cooking and eating quality of rice while increasing yield,but reduced the milling and nutritional quality.Therefore,to a certain extent,dense planting with reduced nitrogen input practice can improve synergistically yield and quality of rice.
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