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Nitrogen deficiency 1. Plants are short, slow growing, and less tillers. 2. The leaves are light green and yellow. As far as the whole plant is concerned, starting from the lower leaf surface, it gradually develops upwards; as far as a leaf is concerned, it starts from the tip of the leaf and then develops to the middle, and finally develops to the whole blade yellowing and the leaves withering. 3. Less roots and slower growth. 4, short spikes, less grain, low 1000-grain weight. 5. The maturity period is earlier than normal land rice.
Phosphorus deficiency 1. Rice seedlings are clustered, the leaves are narrow and erect. 2, the leaves are dark green or gray-green, far away from the green with yellow or yellow-purple. 3, the ratio of sheath and leaf is out of balance, the leaf sheath is long, the leaves are relatively short and easy to dry. 4, the root system is yellowish brown, the root group is small, the roots and lateral roots are not stretched, the roots are soft and the elasticity is small. 5, slow growth, less tiller, flowering, maturity delay, grain is not full, more valleys.
Potassium deficiency
1. The leaves are dark green or bronze, the leaves are thin and thin, the heart leaves are straight, and the old leaves are drawn. 2. Before the tillering, the leaves often have flax leaf spot disease; after tillering, the tip of the old leaf often has small brown spots, and it is downward from the tip of the leaf, and has a mosaic-like spot along the edge of the leaf; at the peak of the tillering, the two leaves at the base are easy to die. After the third and fourth leaves began to have a needle-like brown spot from the tip of the leaf, they gradually developed into strips at the base of the blade, and then connected to each other until the entire leaf died. 3, the root system is dark brown, severe blackening. 4, the stem is weak, easy to break, in the face of small wind and rain will fall. 5, early heading, the number of grains per ear is reduced, and the fruiting is poor.
Boron-deficient rice leaves are dark green, the young leaves are short and narrow, and there are yellow spots in the middle or tip of the leaves. In severe cases, the top stops growing and the growth point dies. The new leaves are folded and curved in white, the roots are brown, the tillers are normal but the plants are short.
The growth and development of manganese-deficient plants are hindered, dwarfed, and the leaves of new leaves are chlorotic, and brown spots appear. In severe cases, the spots are connected in a line. The new leaves are short and the leaves are light.
Copper-deficient leaves appear blue-green, the tip of the leaves is chlorotic, and develops down the sides of the midrib, and then dark brown necrotic spots appear, and the new leaves curl. Zinc deficiency and zinc deficiency symptoms occur more than 2 to 3 weeks after transplanting. The new film fades at the base of the midrib and then spreads across the entire blade, with the youngest leaves being light yellow in the stem. The old leaves first appeared brown spots, then they became streaks, and finally they were burnt. The middle leaves become narrower and the lower leaves become brittle and fragile. The plants are short, the tillers are delayed, the roots are short, the infertility rate of the floret is increased, and the growth and development are delayed.
Deficiency of molybdenum leaves, which affects photosynthesis and respiration, is unfavorable for plant growth and development.
Phosphorus deficiency 1. Rice seedlings are clustered, the leaves are narrow and erect. 2, the leaves are dark green or gray-green, far away from the green with yellow or yellow-purple. 3, the ratio of sheath and leaf is out of balance, the leaf sheath is long, the leaves are relatively short and easy to dry. 4, the root system is yellowish brown, the root group is small, the roots and lateral roots are not stretched, the roots are soft and the elasticity is small. 5, slow growth, less tiller, flowering, maturity delay, grain is not full, more valleys.
Potassium deficiency
1. The leaves are dark green or bronze, the leaves are thin and thin, the heart leaves are straight, and the old leaves are drawn. 2. Before the tillering, the leaves often have flax leaf spot disease; after tillering, the tip of the old leaf often has small brown spots, and it is downward from the tip of the leaf, and has a mosaic-like spot along the edge of the leaf; at the peak of the tillering, the two leaves at the base are easy to die. After the third and fourth leaves began to have a needle-like brown spot from the tip of the leaf, they gradually developed into strips at the base of the blade, and then connected to each other until the entire leaf died. 3, the root system is dark brown, severe blackening. 4, the stem is weak, easy to break, in the face of small wind and rain will fall. 5, early heading, the number of grains per ear is reduced, and the fruiting is poor.
Boron-deficient rice leaves are dark green, the young leaves are short and narrow, and there are yellow spots in the middle or tip of the leaves. In severe cases, the top stops growing and the growth point dies. The new leaves are folded and curved in white, the roots are brown, the tillers are normal but the plants are short.
The growth and development of manganese-deficient plants are hindered, dwarfed, and the leaves of new leaves are chlorotic, and brown spots appear. In severe cases, the spots are connected in a line. The new leaves are short and the leaves are light.
Copper-deficient leaves appear blue-green, the tip of the leaves is chlorotic, and develops down the sides of the midrib, and then dark brown necrotic spots appear, and the new leaves curl. Zinc deficiency and zinc deficiency symptoms occur more than 2 to 3 weeks after transplanting. The new film fades at the base of the midrib and then spreads across the entire blade, with the youngest leaves being light yellow in the stem. The old leaves first appeared brown spots, then they became streaks, and finally they were burnt. The middle leaves become narrower and the lower leaves become brittle and fragile. The plants are short, the tillers are delayed, the roots are short, the infertility rate of the floret is increased, and the growth and development are delayed.
Deficiency of molybdenum leaves, which affects photosynthesis and respiration, is unfavorable for plant growth and development.
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