【摘要】 在盆钵条件下,试验布置在褐土菜园土和草甸土菜园土上。试验表明:施锌量与土壤有效锌含量和植株体内含量呈线性关系。根据这些数量关系计算出育苗阶段两种土壤有效锌缺锌临界值分别为5.32、9.80ppm,致害临界值分别为10.61、28.09ppm,生长在两种土壤上番茄幼苗锌缺锌临界值分别为55.73、65.98ppm,致害临界值分别为81.05、124.11ppm,开花阶段两种土壤有效锌缺锌临界值分别为11.32、13.89ppm,致害临界值分别为16.35、31.95ppm,生长在两种土壤上的番茄植株体内锌缺锌临界值分别为59.71ppm和81.43ppm,致害临界值分别为82.53ppm和124.11ppm。更多还原

【Abstract】 The pot experiment was carried out in gardened drab soil and gardened meaow soil. The results showed that the amount of Zn applied to the soils was in direct proportion to the content of soil available Zn and to the annount of Zn in the plant of tomato,It was found that the relationship of quadratic curve existed between the amount of Zn applied to the soils and the dry weight of the plant, According to the quantity relationship above, the critical concentrations of Znic in the plant of tomato at seedling and flower stage. The deficient critical values in the plant of tomato seedling in the two kind of soils were 55.73 ppm and 65.98 ppm, the harmful critical values 81.05 ppm and 124.11 ppm, respeclively. In the flower stage the deficient critical values in the plant of tomato were 59.71 ppm and 81.43 ppm,the harmful critical values 82.53 ppm and 124.11ppm.更多还原