Study on nitrogen accumulation characteristics of peanuts in different texture soils

In this study, to adopt measures suiting local conditions, reasonable nutrition management and improve the yield of peanuts, the nitrogen absorption, accumulation and distribution characteristics of peanuts in different texture soils were investigated using box-planting methods. The results demonstrated that the times when the nitrogen accumulation of the root, stem and leaf of the peanuts in the sandy soil achieved the maximum value were earlier than those of the peanuts planted in the loam and clay. The nitrogen accumulations of the root, stem, leaf and seed exhibited that the nitrogen accumulation of the peanuts in the sandy soil was high at the early growth stage, that in the loam was high in the middle and late growth stages, and that in the clay was high in the late growth stage. The nitrogen accumulation of the peanuts in the mature period mainly existed in the reproductive body, accounting for 63.76–65.45%, and the accumulated nitrogen in the nutrients accounted for 34.55–36.24%. The accumulated nitrogen amount distributed in the reproductive body in different soils was clay > loam > sand, while the accumulated nitrogen amount distributed in the nutrients in different soils was sand > loam > clay, which was opposite to that of the accumulated nitrogen amount distributed in the reproductive body. The nitrogen of the peanut pods in the sand soil was mainly derived from the translocated amounts of the nitrogen accumulated in the root, stem and leaf, which accounted for a large proportion. The nitrogen of the peanut pods in the clay was mainly derived from the direct absorption by the roots, which accounted for a large proportion. The nitrogen of the peanut pods in loam was mainly derived from both the translocated and accumulated amounts of the nitrogen in the root, stem and leaf and the direct absorption by roots, which accounted for a moderate proportion.