Effects of deeply mechanized fertilizer application on rice quality and nutrient absorption and utilization of direct seeding rice

Using super hybrid rice Peizataifeng and super inbred rice Yuxiangyouzhan as materials,field experiment was carried out to access the effects of deeply mechanized fertilizer application on rice quality,fertilizer use efficiency,nutrient accumulation.Results showed that effects of mechanical deep application of slow-release fertilizer on rice quality and rice N,P and K total accumulation were different due to the dosage of fertilizer and the difference of variety.To some extent,mechanical deep application of slow-release fertilizer can improve milled rice rate,head milled rice rate,amylose content and protein content,reduce chalky rice rate when the increase of fertilizer rate ranged from 0 kg/hm2 to 1 500 kg/hm2.Total N,P and K accumulation and fertilizer(N,P and K) absorption of 100 kg grain showed positive correlation with rice,processing quality,amylase content and protein content,but negatively correlated with chalky rice rate and contrary to N,P and K used efficiency for grain and biomass.Deeply mechanized fertilizer application at rate of 1 200 kg/hm2(F1)was well in obtaining high rice quality and enhancing nutrient absorption and utilization.