Effects of Nitrogen,Phosphorus,and Potassium Dosage and Ratio on Seed Yield and Quality of"Qianhuo No.1"
We studied the effects of formula fertilization on seed yield and quality of"Qianhuo No.1",and screened the best fertilizer ratio suitable for seed production,so as to provide a reference for rational fertilization of"Qianhuo No.1"seed production.The biennial plants of"Qianhuo No.1"were used as experimental materials,"3414"fertilization experiment design was used to determine the effects of different fertilization treatments on seed yield and quality of"Qianhuo No.1"by setting 3 factors of nitrogen,phosphorus and potassium,and 4 levels of each factor.The results showed that:(1)N2P2K1 treatment had the highest seed yield,N3P2K2 treatment had the highest thousand grain weight,N2P2K1 treatment had the highest seed vigour,N2P2K3 treatment had the highest soluble sugar content,N2P1K2 treatment had the highest starch content,N2P3K2 treatment had the highest protein content and N1P2K1 treatment had the highest water content,which increased by 86.81％,19.65％,12.87％,213.87％,29.93％,210.71％and 20％,respectively,over the control,all of which were significantly different.(2)Combined with the comprehensive analysis of membership function and the fitting of fertilizer effect function,it was concluded that under the treatment of N2P2K1,the amount of nitrogen,phosphorus and potassium fertilizer was 180 kg·hm-2,270 kg·hm-2 and 225 kg·hm-2,respectively,and the ratio of nitrogen,phosphorus and potassium fertilizer was 1:1.5:1.25,the seeds of"Qianhuo No.1"could obtain the highest yield and the best quality.In conclusion,the optimal application amount of nitrogen,phosphorus and potassium fertilizers for the seeds of"Qianhuo No.1"in the production area of Congjiang County,Guizhou Province is 180 kg·hm-2,270 kg·hm-2,225 kg·hm-2,and the ratio of nitrogen,phosphorus and potassium fertilizers is 1:1.5:1.25.
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