Q: Farmers now know that nitrogen, phosphorus, and potassium fertilizers are important for all crops. High yields and high quality can't live without them. However, if the lack of vegetables, nitrogen, phosphorus, potassium will produce what symptoms?
Answer: Crop nutrient deficiency is an external reaction to the internal nutritional status of crops. When there is a deficiency in vegetables, there are special symptoms.
Chinese cabbage
Nitrogen deficiency is short of nitrogen in the early stages, the plants are short, the leaves are small and thin, the leaves are yellow, and the stems are slender and grow slowly. The lack of nitrogen in the middle and late stages, the leaf ball is not substantial, the heart period is delayed, the leaf fiber is increased, and the quality is reduced.
Phosphorus deficiency does not thrive and plants dwarf. The leaves are small and dark green. Fine stems, weak root development.
Potassium deficiency turns brown from the lower leaf margins, withering, gradually developing toward the medial or upper leaves, with the lower leaves wilt. Resistance to soft rot and downy mildew.
tomato
The growth of nitrogen deficiency is stagnant and the plants are short. The leaf color is light green or yellow, the leaves are small and thin, and the veins change from yellow-green to deep purple. Stems harden, rich in fiber, and dark purple in color. The color turns yellow and it is easy to fall off. Small fruit, rich in wood.
The early leaves of phosphorus depletion showed a reddish purple color. The mesophyll tissues initially showed a patchy shape and then spread to the entire leaf. The veins gradually turned reddish purple, and the leaf clusters finally became purple. Slender stems, rich in fiber. The blade becomes smaller and the result is delayed. Due to the lack of phosphorus, nitrogen absorption was affected and leaf curling appeared later.
Potassium-deficient plants grow very slowly. The young leaves shrank slightly, the old leaves first became gray-brown, then appeared greenish yellow at the edges and finally browned to death. Stems harden, rich in wood, slender. Roots are stunted, slender, often brownish. The late fruit is not round and angular, the flesh is not full and there are gaps, and the fruit lacks red pigment.
cucumber
Nitrogen deficiency in early nitrogen deficiency, growth stagnation, small plants. The leaf color gradually changes to yellowish green or yellow. Stalks are slender, hard and rich in fiber. The fruit is pale in color and has a pale yellow color at the end with a petal, which becomes a sharp cut.
Phosphorus deficient plants are short, weak, brown and necrotic between veins. Phosphorus depletion affects flowering and differentiation, and the number of female flowers decreases. Fruit deformity.
The greenish decayed tissue appeared near the leaf margin of potassium deficiency, and the lower old leaf first turned yellow. The tip of the fruit is enlarged and the stem is stunted.
eggplant
Nitrogen-deficient plants are short. The leaves are small and thin, and the leaves are light green. The result was nitrogen deficiency, serious flowering and fruit drop.
The phosphorus deficiency leaves are dark purple. Stalks are slender and well-developed. Flower bud differentiation is delayed and fertility is delayed.
The leaves of the old leaves of the potassium deficiency turned yellow-brown and gradually withered. Reduced disease resistance.
radish
The growth of nitrogen deficiency was stagnant, the leaves were narrow and thin, and the leaves were yellow. The stem is weak. The roots are small and more lignified. Increased spicy taste.
Phosphorus leaves have a reddish purple back, and the leaves are small and shrinking.
The potassium deficiency initially appeared dark green in the middle of the leaf, curled the leaf margins, and appeared yellowish to hessian. The lower leaves and stems appear dark yellow to bronze and the leaves thicken. The roots do not expand normally.
Expert Tips:
â— Vegetables lack the typical symptoms of nitrogen, phosphorus and potassium, and may vary between different types.
â— Identifying the lack of vegetables The typical symptoms of nitrogen, phosphorus and potassium are one of the nutrient diagnostic techniques for rational fertilization.
Author: Chen Shou Lun