Crop nitrogen deficiency: the new shoots are thin and short, the leaves are small and erect, the color is grayish green, the petioles, veins and surface layer turn red; the flowers are small, the fruit is precocious, it is easy to fall off, the roots are underdeveloped, the fine roots are more, the roots are less , the new roots are yellow.
Phosphorus deficiency in crops: different crops have different symptoms. When corn is deficient in phosphorus, it will show slow growth at seedling stage, 5 leaves are more obvious, leaf color is purple, grain is not full; wheat phosphorus deficiency is characterized by slow growth of seedlings The root system is dysplastic, the tiller is reduced, the base of the stem is purple, the leaf color is dark green, slightly purple, and the ear small particles are small; when the rice is deficient in phosphorus, the tiller is reduced, the plant is short, the new leaves are dark green, the old leaves are purple, and the flowers are less grainy. .
Potassium deficiency in crops: The initial performance is that the tip of the lower leaves turns yellow, and gradually turns yellow along the edge of the leaves, but the leaves and veins of the veins remain green. When severe, they gradually develop upward from the lower leaves, eventually leading to the yellowing of most leaves and the edges of the leaves. It is burning. Potassium deficiency in cereal crops showed weak tillering, short internodes, weak leaves, and soft and easy stalks. Deficiency of potassium in dicotyledonous leaves causes the leaves to curl, gradually shrink, and sometimes the leaves are broken, but the middle part of the leaves remains green.
Phosphorus deficiency in crops: different crops have different symptoms. When corn is deficient in phosphorus, it will show slow growth at seedling stage, 5 leaves are more obvious, leaf color is purple, grain is not full; wheat phosphorus deficiency is characterized by slow growth of seedlings The root system is dysplastic, the tiller is reduced, the base of the stem is purple, the leaf color is dark green, slightly purple, and the ear small particles are small; when the rice is deficient in phosphorus, the tiller is reduced, the plant is short, the new leaves are dark green, the old leaves are purple, and the flowers are less grainy. .
Potassium deficiency in crops: The initial performance is that the tip of the lower leaves turns yellow, and gradually turns yellow along the edge of the leaves, but the leaves and veins of the veins remain green. When severe, they gradually develop upward from the lower leaves, eventually leading to the yellowing of most leaves and the edges of the leaves. It is burning. Potassium deficiency in cereal crops showed weak tillering, short internodes, weak leaves, and soft and easy stalks. Deficiency of potassium in dicotyledonous leaves causes the leaves to curl, gradually shrink, and sometimes the leaves are broken, but the middle part of the leaves remains green.
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