摘要:
宁德、南平两地区稻田土壤有效锌含量平均为1.77ppm,如以0.5ppm为水稻缺锌临界值来衡量稻田供锌丰缺,两地区有近30%的稻田属于轻度缺锌或潜在缺锌,10%的稻田严重缺锌。土壤有效锌低于1.0ppm的稻田,施锌肥有增产效果,而高锌的土壤又含较高的速效磷,水稻为了求得高水平的磷锌营养平衡,施锌仍有增产效果。稻田施锌,能增加糙米的粗蛋白和氨基酸含量,提高稻米营养价值。锌肥用法,以沾秧根、根外喷施较佳,为了治理稻田缺锌。锌肥用量较大的可作基肥施入。锌肥以早施为原则,亩施7水硫酸锌1—1.5kg为宜。
Abstract:
The average conent of availabe Zn in paddy fields of Ningde and Nanping Areas is 1.77 ppm.If the critical value of Zn deficiency for rice plant is 0.5ppm,about 30% area of paddy field in above two areas belongs to slightly Zn-deficient or potentialy Zn-deficient condition; about 10% belongs to seriously Zn-deficient condition.When the Zn content in paddy field is below 1.0ppm,the application of Zn fertilizer will receive a yield-increasing effect.In the case soil contains high Zn and available P,the Zn application will meet the requirement of high level of Zn.P nutritional balance and enhance the grain yield.The Zn application improve the protein and amino-acid contents in brown rice thus enhance the nutritional value of rice.It is suggested that Zn fertiliger will be applied in earlier stage of rice growth,and suitable amount is 15-30kg (ZnSo4,7H2O) /ha.The better Zn-applying methods are coating the roots of rice seedlings and foliage dressing.In severely Zn-deffecient soil,more high amount of Zn may be used as basal.
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