Effects of foliar spraying of Zn nanoparticles during the jointing stage on rice yield,quality and grain zinc content
In view of the current situation of low zinc content in rice,Nanjing 9108 was used as the material in this study.The effects of nano-zinc suspension on rice yield,quality and grain zinc content were analyzed by foliar spraying exper-iments at jointing stage with different dosages(0 kg/hm2,0.2 kg/hm2,0.4 kg/hm2,0.6 kg/hm2,0.8 kg/hm2,1.0 kg/hm2).The results showed that spraying high dosages(0.8-1.0 kg/hm2)of nano-zinc suspension at jointing stage could significantly increase the number of grains per panicle,seed setting rate and 1 000-grain weight of rice.When the application amount of nano-zinc was 1.0 kg/hm2,the yield of rice increased by 3.9%compared with no nano-zinc treatment(CK),and the effect was significant.Compared with CK,spraying 0.8-1.0 kg/hm2 nano-zinc at jointing stage could significantly increase brown rice rate,milled rice rate and head rice rate,and could reduce chalky grain rate and chalk-iness degree of rice.The application of nano-zinc had positive effects on the taste value,disintegration value and recovery val-ue of rice,but had no significant effect on protein content or amylose content.Spraying nano-zinc can significantly increase the grain zinc content,promote the enrichment of zinc in edible parts,and improve the bioavailability of zinc.Therefore,spraying 0.8-1.0 kg/hm2 nano zinc suspension at jointing stage is beneficial for improving the zinc content in rice grains to a-chieve high quality and high yield of rice.
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