氯浓度容量对红壤性稻田水稻影响的研究

The Study of Chlorine Ion Capacity on Rice Plant in Red Paddy Field

选用典型红壤性水稻土进行水稻施氯盆栽试验,结果表明:水稻耐氯能力强,植株含氯量随土壤氯浓度的增加而增加,施氯600ppm以下,对水稻产量和品质均无不良影响;浓度增大到1200ppm、2400ppm时会抑制水稻前期对磷的吸收,从而影响水稻的生长,分蘖,推迟生育期,并发生氯中毒症状。考虑到长期施用含氯化肥,土壤中有氯离子积累,故稻田施氯浓度在300ppm以下为宜。在控制无氯淋失条件下,得出产生轻度毒害和严重毒害的土壤对氯容量临界值,红砂泥田分别为0.0643％、0.121 2％;黄泥田为0.0909％和0.1621％。

Pot-cultivation and Tillage, with Cl application to rice in typical red soil paddy were carried out. The result indicated that rice plants appeared to be highly tolerant to Cl-. When Cl-con-tent at a level of less than 600ppm was added to fields, there was no side-effect on rice grain yield and guality. Cl-content of plants would increase as Cl- content in soil rose. If Cl-content in soil was added at 1 200ppm or 2 400ppm,the P absorption of rice would be inhibited in earlier stage. Further more, there were side-effects on rice growth and tillering. Mean while, the growth duration would be prolonged. In additions, the rice plant displayed the symptom of Cl-toxic. Because the Cl-will be accumlated in paddy soil when Cl-fertilizer is applied successively, the optium Cl-content added to paddy soil should be less than 300ppm. The CPcritical levels of red sandy soil and alluvial soil were 0. 064% and 0. 090 9% for light roxic, 0. 121 2% and 0. 162 1% for severe toxic, respectively.