控释肥残膜对土壤性质和作物生长的影响

EFFECT OF CRFS RESIDUAL COATING ON SOIL PROPERTY AND CROP GROWTH

通过室内残膜强化试验 ,研究了控释肥残膜对土壤性质及作物生长 (以花生为例 )的影响 ,结果表明 ,土壤中残膜含量在 0 .0 0 8范围内 ,控释肥残膜可明显降低土壤的透水性 ,提高土壤的田间持水量和保水性 ,随膜含量的增加 ,当达到 0 .0 10时 ,土壤的田间持水量却明显降低 ,透水明显加快 ,土壤保水性也随之降低。另外随土壤中膜含量的增加 ,土壤容重降低 ,土壤比重变化不大 ,土壤孔隙度明显增加。强化试验结果进一步表明 ,在一定的土壤残膜含量范围内 ,随膜含量的增加 ,花生生长也呈增加趋势 ,其中最适宜花生生长的土壤膜含量范围为 0 .0 0 42 6～0 .0 0 5 74。控释肥残膜在一定范围内对土壤和作物是有益的。

Effect of Controlled Released Fertilizers(CRFs) residual coating on soil property and peanut growth was studied in coating aggrandizing experiment. The result showed that CRFs residual coating could reduce the soil water penetrability, increase the field moisture capacity and the water of conservation within the content of 0.008 residual coating rate. However, when the rate of soil residual coating reached 0.010, the field moisture capacity was very low, the water of conservation was very poor, and the soil water penetrability was very high. In addition, the soil bulk density decreased significantly, the specific gravity had no difference, and the total porosity increased significantly with the increasing of residual coating content. Based on relation of different CRFs residual coating rates with height, side branch length, fresh weight, dry weight, root volume and plant index, the appropriate residual coating content for peanut is 0.00426～0.00574.