Nitrogen deficiency: Light green leaves, base leaves (old leaves) turn yellow and gradually develop upwards, brown when dry. Plants are short, with few branches (branches) and premature aging. If nitrogen deficiency occurs in fruit trees, it is characterized by less fruit, less fruit, and harder skin. Phosphorus deficient: The leaves become smaller, the leaves are dark green or grayish green, lack luster, often red or purple. Such as corn, tomato and other crops on the stems and leaves, there are obvious purple stripes or spots. The stems are short and fine, yellowing of the base leaves, delayed heading, flowering and maturation, and the seeds are small and not full. Corn ear tipped. Sweet potato and potato tubers become smaller. Fruit trees fall and fall. Potassium deficiency: The stems are easily lodged, the edges of the leaves are yellow, scorch, and fragmented, and necrotic spots appear in the veins. The entire leaf is sometimes curled or shrunken, and the brown roots are more. Grain crops and other sugar-rich crops require large amounts of potassium at later growth stages, such as cereals and potatoes, watermelon, and grapes. Iron deficiency: The veins are chlorotic and show a clear reticular pattern. When severe, the entire leaf (especially the young leaf) appears pale yellow and even white. Northern fruit trees such as apples and pears are prone to symptoms. Iron-sensitive crops include peanuts, corn, sorghum, potatoes, vegetables (spinach, tomatoes, etc.). Boron deficiency: First appeared at the top and there was a phenomenon of cessation of growth. Roots are underdeveloped. Dark green leaves, small leaves, hypertrophy, deformed young leaves, shrinkage. Irregular green leaves between veins, flower development is not perfect, false ears, roots, berries heart rot and necrosis. Such as soybean bud disease, apple fruit disease, celery stem disease, radish heart rot, etc. are all due to the lack of boron. Zinc deficiency: leaves bleed, leaves cluster, spots appear on both sides of the leaves, the plants are short, internode shortening, growth period delayed. Such as tree lobular disease, corn white seedlings and so on. Copper deficiency: New leaves appear chlorotic on young shoots, and white curly leaves appear as pods between leaves. Necrotic spots appear on the leaves, and then wither and die. Such as cereal crops showed clusters of plants, the top white, serious heading, not strong. The lack of copper in fruit trees showed that the top leaves showed clusters, and the leaves and fruits were all faded. Manganese deficiency: Early lack of manganese, small necrotic spots appear between the leaves of the veins, dark green stripes appear in the veins, showing ribs. The loss of green is first manifested in the new leaves. Molybdenum deficiency: it first appeared on the old leaves. The chlorotic veins of the leaves formed yellow-green or orange-red leaf spots. The leaf margins curled and the leaves withered and even necrotic. The leaves are bent upwards and withered, the flower development is inhibited, and the seeds are not full. The efficiency of molybdenum fertilizer is mainly reflected in bean and cruciferous crops, with soybean and peanut being the most obvious.
Coarse grain usually refers to rice, wheat, corn, soybean and potato five crops other than the grain and bean crops. The main are: sorghum, millet, buckwheat (sweet buckwheat, buckwheat), oats (naked oats), barley, millet, barley millet, barley millet, grain amaranth and beans (kidney beans), mung beans, adzuki beans (adzuki beans, adzuki beans), broad beans, peas, cowpea, lentils (soldier beans), black beans and so on. It is characterized by short growing period, small planting area, special planting area, low yield, and generally contain rich nutrients. The ancient Chinese medicine book "Huangdi Neijing" records that "five grains are for raising, five fruits are for helping, five livestock are for benefiting, and five vegetables are for filling". Some trace elements, such as iron, magnesium, zinc and selenium, are more abundant in coarse grains than in refined grains. The value of these trace elements to human health is considerable. Coarse grains are also richer in potassium, calcium, vitamin E, folic acid and bioflavonoids than refined grains.
Whole Grains are rich in nutrients. Oats, for example, are rich in protein; Millet is rich in tryptophan and carotene. Beans are high in quality protein; Sorghum is rich in fatty acids and iron; Tubers contain carotene and vitamin C. In addition, coarse grain still has the effect of reducing weight. Such as corn also contains a lot of magnesium, magnesium can strengthen intestinal wall peristalsis, promote the excretion of body waste, is very beneficial to weight loss.
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