论文部分内容阅读
蔬菜是高度集约栽培的作物。需肥量较大,光靠土壤和底肥很难满足其生长发育的需要。因此。掌握蔬菜缺素的症状,及时进行补充,是确保蔬菜丰产优质的有效措施。 1、缺氮 绝大多数蔬菜植株缺氮或氮素不足的症状非常相似。最初在老叶上呈现淡绿色或黄色,茎秆也随之发生同样的变化。以后逐渐扩展到整个叶簇。最后,整个植株变成淡黄色或褐色。 发现蔬菜缺氮后,应及时在根
Vegetables are highly intensively cultivated crops. Large amount of fertilizer needed, depending on the soil and base fertilizer is difficult to meet the needs of its growth and development. therefore. Grasp the symptoms of vegetable deficiency, timely replenishment, is an effective measure to ensure high-yield vegetables. 1, nitrogen deficiency Most vegetables nitrogen deficiency or nitrogen deficiency symptoms are very similar. The pale green or yellow color is initially present on the old leaves and the same changes occur in the stalks. Later gradually extended to the entire leaf cluster. Finally, the entire plant turns pale yellow or brown. Found that vegetables lack of nitrogen, should be in time at the root