What symptoms can bean deficiency cause? How to manage?

Bean is a vine vegetable plant that everyone is very familiar with. The planting area in China is also very large, so fertilization is very important when planting beans. Rational fertilization can supplement various nutrients for beans, thus improving the yield and quality of beans. However, if the nutrients are insufficient, all kinds of element deficiency will appear in beans. What are the manifestations of element deficiency in beans? Let's take a look!

Element-deficient diseased beans 1, nitrogen-deficient.

If the beans are short of nitrogen, the main symptoms will appear at the bottom of the beans, and the leaves at the bottom will start to turn yellow. The newly grown leaves are small and thin, and the color is dim. Plants will gradually become shorter and thinner, and the number of branches will also decrease. There are a large number of fallen flowers and fruits, and the growth rate of beans will also drop significantly, resulting in a large number of deformed fruits. The stress resistance of plants will also become worse, and the incidence will be higher.

Beans are symptom 2 of element deficiency. aphosphorosis

If the growth of beans is short of phosphorus, the growth rate of beans will decrease obviously. Similar to the symptoms of nitrogen deficiency, the stem becomes very thin with few or no branches. Root system development is seriously affected, with few new roots and poor growth ability. Although the color of the leaves will deepen, it will lead to dullness, and the petiole will change from green to purple, which is easy to fall leaves.

Element-deficient diseased beans 3. Potassium deficiency.

In the growth process of beans, if potassium is lacking, the old leaves at the base of the plant will be simple and the edges will turn yellow. Moreover, the leaves will start to dry up and gradually turn brown, but around the veins and in the middle of the leaves are still green. If potassium deficiency is serious, a large number of leaves in the middle and upper parts of the plant will have dry tips and dry edges. Stems become thin and long, prone to lodging, and pods are seriously underdeveloped. Cold-resistant and drought-tolerant, easy to early water and early aging, low yield.

Beans are symptom 4 of element deficiency. Calcium deficiency.

Calcium deficiency in pods will affect the cell division of plants, resulting in inhibition of the growth and development of root tips and stem tips. With the rapid decline of plants, the new leaves on the upper part begin to change, and usually the shape will also begin to change. The tip and edge of the leaf begin to necrosis from the outside to the inside, and the terminal bud grows poorly, which will lead to ulceration and death in severe cases, and the root tip is also prone to similar situations.

Beans are element deficiency disease-shaped. 5. Boron deficiency

If beans lack boron, their symptoms will first appear in the heart leaves, flowers and fruits of plants. In the early stage of boron deficiency, the newly germinated branches and tops no longer grow, and the new leaves are deformed and withered. Irregular chlorosis patches will also appear between veins. The old leaves at the lower part of the plant begin to thicken, and the leaves and stems will become brittle and easily broken. When boron deficiency is serious, the growing points of roots and aboveground parts will begin to die, and the amount of flowers and fruits will decrease obviously, resulting in the phenomenon of falling flowers, falling flowers and no fruit.

When symptoms of nitrogen deficiency appear, nitrogen fertilizer should be applied in time, urea 15 kg or ammonium sulfate 30 kg per mu, mainly by point application or spreading application, 0. Spraying 3% urea aqueous solution on the leaves.

(2) Phosphorus deficiency should be mainly based on the application of base fertilizer. After the previous crop is harvested, before cowpea is sown or planted, 30 kilograms of diammonium phosphate should be applied per mu, mainly through furrow application or hole application, preferably at the same time with organic fertilizer.

When phosphorus deficiency symptoms appear during the growth period, potassium dihydrogen phosphate 10kg should be applied topdressing per mu, and acupoint application and foliar spraying should be 0. 3% potassium dihydrogen phosphate aqueous solution.

(3) When symptoms of potassium deficiency appear, topdressing 50% potassium sulfate 10kg per mu, point application or furrow application, supplemented by watering and spraying 0.

3% potassium dihydrogen phosphate aqueous solution.

(4) Cowpea is prone to calcium deficiency in sandy soil. When applying base fertilizer, the amount of organic fertilizer should be increased. In neutral sandy soil, calcium superphosphate should be used as base fertilizer, 40? 50kg, cowpea growth appears calcium deficiency phenomenon, 0 can be sprayed.