农田土壤养分平衡状况及其评价的试点研究

Nutrient Balance of Agricultural Soils and Their Evaluation

本文研究了黄淮海平原二个主要农业自然经济类型区定位监测点的农田土壤养分收支平衡状况 ,并用养分允许平衡盈亏率进行评价。玉田县和陵县试区 ,N盈余分别平均为 82 .7～10 7.1、32 .0～ 184 .2 kg/ hm2 .a,可能会造成 N素的大量损失和引起较严重的环境污染 ;P2 O5盈余分别平均为 2 1.1～ 2 2 .9、74 .3～ 77.5kg/ hm2 .a,玉田县试区磷肥的施用基本合理 ,而陵县试区磷肥未得到合理高效利用 ;K2 O亏缺分别平均为 54.2～ 78.5、183.3～ 2 16.7kg/ hm2 .

Nutrient balance of agricultural soil in fixed monitoring sites in two main agricultural regions of Huang huai hai Plain was studied, and evaluated by nutrient permissible surplus and deficit rate. The results indicated that in Yutian and Ling county experimental regions, N surplus was 82.7 to 107.1 and 32.0 to 184.2 kg/hm 2.a on average, respectively, which will possibly result in great quantities of N losses and relatively serious pollution of the environment. P 2O 5 surplus was 21.1 to 22.9 and 74.3 to 77.5 kg/hm 2, and its application in Yutian county was basically rational, but in Ling county it was not efficiently used. While K 2O deficit was 54.2 to 78.5 and 183.3 to 216.7 kg/hm 2.