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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％。
The results showed that the chlorine tolerance of rice was higher than that of the control. The chlorine content of the plant increased with the increase of soil chloride concentration. Under the condition of 600ppm chlorine, it had no adverse effect on the yield and quality of rice. Concentration increased to 1200ppm, 2400ppm will inhibit early rice absorption of phosphorus, thereby affecting rice growth, tillering, delayed growth period, and the occurrence of chlorine poisoning symptoms. Taking into account the long-term use of chlorinated fertilizers, soil chloride ion accumulation, it is the rice paddy concentration of 300ppm or less is appropriate. Under the control of chlorine-free leaching conditions, the critical chlorine-to-chlorine content of soil with slight toxicity and severe poisoning was obtained, which were 0.0643% and 0.121 2% for red sand muddy fields and 0.0909% and 0.1621% for yellow muddy fields.