Effects of different fertilizer types and fertilization methods on quality of peanut kernels
To further explore the regulatory effects of fertilizer techniques as"layered fertilization"and"nitro-gen reduction and calcium increase"on peanut kernel quality,field experiments were conducted to clarify the intrin-sic relationship between techniques and quality.In experiment 1,two experimental sites(Jiyang and Yinmaquan)were selected,with two calcium fertilizer levels(0 and 600 kg·hm-2)and five nitrogen fertilizer levels(0,75,150,225,300 kg·hm-2).In experiment 2,field trial was carried out in Jiyang site from 2021 to 2022.Two fertilization methods,namely mechanical laying-strip application(L)and manual surface broadcast application(B),with two fer-tilizers(SF,slow-release compound fertilizer,with a release period of 100 days;CF,common compound fertilizer)were designed,with a control(N0)of zero nitrogen fertilizer.Results showed that:(1)nitrogen application increased crude protein content in kernel by 1.24-3.57 percentage points.The total amino acid content increased by 1.19-3.70 points,and linoleic acid content by 0.93-2.41 points.Contents of some fatty acids and amino acids increased with the increase of nitrogen application.However,the oil content of the kernel was reduced by 1.70-5.34 percent-age points.Compared with the treatment with zero calcium,contents of crude protein and total amino acids in seeds decreased by 0.10-1.55 percentage points and 0.02-1.23 percentage points,respectively under 600 kg·hm-2 calci-um,with oil content increased by 0.16-2.62 points.Thus the combination application of N and Ca fertilizers could put down the increase of crude protein and the decrease of oil content.The cultivation of reducing nitrogen fertilizer and increasing calcium fertilizer showed their beneficial to regulate and improve kernel quality.(2)Under the same fertilization method,compared with compound fertilizer(CF),specialized compound fertilizer(SF)treatment in-creased crude protein and oil content in kernels.Compared with manual surface broadcast(B),layered application of compound fertilizer(CFL)or peanut specific compound fertilizer(SFL)reduced the crude protein and total amino acid contents in kernels by 0.34-1.39 points and 0.14-0.34 points,respectively,while the oil content in kernels in-creased by 0.22-1.16 points.(3)Significant positive correlations were found between yield and crude protein,yield and total amino acid,and yield and linoleic acid content(P<0.01).Significant negative correlation was found be-tween yield and oil content,yield and oleic acid content.Extremely positive significant correlations were found be-tween yield and crude protein,total amino acids,linoleic acid content,and also between crude protein and total ami-no acids,linoleic acid content.Extremely negative significant correlations were found between crude protein and oil content.Negative significant correlations were found between yield and oil content,linoleic acid content.To sum up,in production,it is necessary to increase oil production with high crude protein.It is recommended to adopt the green and efficient cultivation technology of reducing nitrogen and increasing calcium.It is also possible to apply the special compound fertilizer for peanut and support the efficient cultivation technology of layered fertilization.
peanutkernel qualityfertilizer typeslayer fertilizationcalcium and nitrogen application
国家科技期刊平台
NSTL
万方数据
