Optimal Zinc Application Rate for Rice Yield and Quality Improvement in Jianghan Plain
Four rice varieties(Lixiang 85,Xiangyaxiangzhan,Heliangyou 927 and Changliangyou 8)were selected as materials,and the changes of rice yield and quality were studied under four zinc application rates[0 kg/ha(CK),7.5 kg/ha(Zn1),15 kg/ha(Zn2)and 30 kg/ha(Zn3)]in field,so as to provide a theoretical basis for the application of zinc fertilizer in high-quality rice.The results showed that zinc application could significantly increase rice yield,and the rice yield showed a trend of first increasing and then decreasing with the increase of zinc application rate.Overall,the highest yield was observed in Zn2 treatment,followed by Zn1 treatment.The yields of Lixiang 85,Heliangyou 927 and Changliangyou 8 were the highest under Zn2 treatment,and the yield of Xiangyaxiangzhan was the highest under Zn1 treatment,followed by Zn2 treatment.Compared with CK,the yields of zinc application treatments increased by 8.1%—28.8%.Zinc had an obvious optimization effect on the processing quality,and the brown rice rate,milled rice rate and head rice rate were generally higher under Zn1 and Zn2 treatments.The amylose contents of different zinc treatments varied for different varieties,among which Lixiang 85 was the highest under Zn1 treatment,Changliangyou 8 was the highest under Zn2 treatment,and Xiangyaxiangzhan and Heliangyou 927 were the highest under Zn3 treatment.For characteristic values of RVA spectrum,the breakdown of Lixiang 85,Xiangyaxiangzhan and Changliangyou 8 was the highest under Zn1 treatment,while the setback of Lixiang 85 and Heliangyou 927 was the lowest under CK,and that of Xiangyaxiangzhan and Changliangyou 8 was the lowest under Zn1 treatment.The crude protein content of all varieties increased first and then decreased with the increase of zinc application rate.The crude protein contents of Lixiang 85 and Heliangyou 927 were the highest under Zn1 treatment,and thoese of Xiangyaxiangzhan and Changliangyou 8 were the highest under Zn2 treatment.Overall,the contents of albumin,globulin and prolamine were the highest under Zn2 treatment,and the content of globulin was the highest under Zn1 treatment.The content of zinc in brown rice and milled rice also increased first and then decreased with the increase of zinc application rate.Lixiang 85 and Heliangyou 927 had the highest zinc content in brown rice under Zn1 treatment,which were 23.1 mg/kg and 19.8 mg/kg,respectively;the zinc contents in brown rice of Xiangyaxiangzhan and Changliangyou 8 were the highest under Zn2 treatment,which were 20.0 mg/kg and 17.7 mg/kg,respectively.In addition,the content of Zn in brown rice was higher than that in milled rice.Considering rice yield,quality and other factors,the optimal zinc application rate in Jianghan Plain is 7.5-15 kg/ha.
国家科技期刊平台
NSTL
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