蔬菜看叶施肥法植株瘦小，叶色变淡，甚至变黄，瓜类出现花打顶，甘蓝出现桔红色或紫红色，是缺氮肥，应及时施速效氮肥或喷０．２－０．３％尿素溶液。番茄叶片显淡紫色，是缺磷肥，应及时在根部施过磷酸钙，或叶面喷肥２－５％的过磷酸钙浸出液，０．５－１％磷酸二氢钾... Vegetable leaf fertilizer law to see thin, leaf color fades, or even turn yellow, melons appear topping, cabbage appear orange or purple, nitrogen deficiency, nitrogen fertilizer or spraying should be promptly 0.2-0.3 % Urea solution. Tomato leaves were lavender, phosphorus deficiency, should be promptly applied in the roots of calcium phosphate, or foliar fertilizer 2-5% superphosphate leaching solution, 0.5-1% potassium dihydrogen phosphate ...