应用土壤盐碱改良剂控制水稻苗期盐害的研究

Application of Conditioner Yanjianfeng in Controlling Salinity of a Saline/Sodic Soil Grown Paddy Rice Seedlings

采用田间试验方法,研究了施用不同剂量的土壤盐碱改良剂对控制水稻苗期盐害的作用。结果表明,①稻田苗期施用7.5,11.25,15kg·hm-2的土壤改良剂,均使土壤中全盐、氯根、pH值下降,以11.25kg·hm-2用量的下降幅度最大。②苗期插秧施用土壤改良剂,稻田水的矿化度、氯根、pH值下降,水质得到改善,以15kg·hm-2用量,效果最好。③3种剂量均表现为分蘖率明显高于对照,其中以11.25kg·hm-2用量最为突出。④3种用量没有明显差异,从经济用量角度讲,提倡7.5kg·hm-2为最佳用量。

Lower surviving rate of transplanted seedlings of paddy rice is quite common in saline/sodic soil. Several trials were done by applying varied dosages of a salinity/sodicity soil conditioner, in Yanjianfeng, to show the efficacy of the conditioner. It has been discovered that:(1) With field applications of 7.0, 11.25 and 15 kg· hm- 2 decreased the soil salts, Cl- , and pH value and the peak value was found to be 11.25 kg· hm- 2.(2) Application of soil conditioner during transplantation could improve water quality, decreased the contents of Cl- and pH in paddy water. The best result was observed in the treatment with dose of 15 kg· hm- 2.(3) Tillering rates were apparently higher in all three treatments than in the control. The treatment by 11.25 kg· hm- 2 exhibited the best result.(4)There is no distinctive difference between three treatments,suggesting that the dosage may be optimized as 7.5 kg· hm- 2 for the practical application by considering economic purpose.