板栗关键生育期不同氮肥分配对土壤微量元素的影响

Impacts of Different Nitrogen Fertilizer Allocation on Soil Trace Elements during the Critical Growth Period of Chestnut

氮肥的施用能够影响板栗对微量元素的吸收,从而引起土壤中微量元素含量的变化,本文通过分析氮肥在板栗各个关键生育期的分配,探究促进板栗吸收土壤微量元素的施氮策略。结果发现,板栗盛花期、果实膨大期至果实采收期土壤中Mn、Cu、Zn的元素含量总体呈现先降低后增加的趋势,土壤中Fe元素含量呈现不断降低的趋势。在氮肥总施用量均为750 kg/hm^(2)的情况下,N7处理土壤中Mn、Cu、Fe、Zn元素含量在各生育期均处于较低水平,表明N7处理即盛花期、果实膨大期与采收期按照2∶3∶5的比例施用氮肥,有利于板栗根系对Mn、Cu、Fe、Zn元素的吸收。

The application of nitrogen fertilizer can influence the uptake of micronutrients by chestnut trees and induce alterations in soil micronutrient levels.This study investigated strategies to enhance chestnut tree assimilation of soil micronutrients through an analysis of nitrogen fertilizer allocation during key growth stages.It was found that there was generally an initial decrease followed by an increase in Mn,Cu,and Zn contents in soil.in Flowering perind,fruit enlargement periocl and fruit harvecest period.However,Fe content showed a continuous decline.Among all treatments tested,N7 treatment consistently exhibited lower levels of Mn,Cu,Fe and Zn contents in soil throughout each period,when the total application rate of nitrogen fertilizer was 750 kg/hm^(2).Therefore,applying a ratio of 2∶3∶5 for nitrogen fertilizer during the flowering period,fruit enlargement period and fruit harvest proved beneficial for promoting Mn,Cu,Fe and Zn absorption by chestnut trees.