First, yellow seedlings (1) basal deficiency. For example, seedlings mainly rely on the endosperm for growth before the three-leaf stage, and mainly absorb the roots from the soil after the three-leaf stage. Some people mistakenly believe that the rice seedlings during the seedling stage are small and do not need to be fertilized, and the seedlings are yellow due to nitrogen deficiency. (2) Physiological premature aging is yellow. Its shape spread from the lower to the upper, the diseased leaves are orange-yellow, with metallic light, or occurred throughout the field or into a piece, and there is no spot and sterile pus on the leaves. Their inducement is due to poor root development. (3) Yellow fertilizer damage. Ammonium bicarbonate, ammonia, and pesticides are used improperly to cause poisoning. Rice leaves are bright yellow or golden, often accompanied by burning spots. (4) High pH. The seedbed is not acid-adjusted and its pH is too high, affecting nutrient uptake and yellowing due to malnutrition. (5) The sudden drop in temperature. In spring, the temperature in my county has a large range of changes. The sugar content in the three-leaf stage seedlings is low, and the ability to resist coldness is reduced. The sudden changes in temperature will weaken the root absorption capacity and cause yellowing.
Second, the leaves on the spot (1) Flax spots. The lesion initially resembled the size of a needle, and gradually formed an oval spot. It resembled sesame seeds. The color was divided into 3 layers. The outer surface was yellowish halo. The edges were dark brown and the center was gray-yellow. If the light was viewed, there were thin stripes and both ends of the lesion. No necrotic lines. (2) Brown streaks. The base of the midrib of the leaflet firstly occurs, then extends upwards and downwards, stretching like a brown stripe. The diseased part seeps out milky sap, and the diseased strain rots and rot smells. The diseased part is dead in the heart. (3) potassium deficiency. The diseased leaf spot is elliptical or irregularly shaped, but it is not contagious. It mostly occurs after the three-leaf stage and is associated with low temperatures. (4) Rice blast lesions. There are two types of acute type and chronic type. The acute type spot is dark brown, followed by an elliptic spot with gray-green moldy objects on the back; chronic type, spotted spindle-shaped, red-brown on the side, gray on the center, with a brown line running through the middle of the lesion, when wet, on the back Gray mold.
Third, blue and dry (1) physiological blue and dry. The base of the stem is free of insects, disease-free and sterile cores, and it is blighted due to the sudden high temperature and physiological water loss. (2) The disease is blue and dry. Such as Pediococcus sclerotiorum, bacterial base rot disease withered; the former rice plant soft rot, dark brown spots, sheaths and stems are often smaller than the leek seed black sclerotia; the latter peeled off the stem Filled with stinky water, but with a sterile nucleus, the basal gray rat rotten.
Fourth, dry heart (1) è¼è›„ 枯 damage heart. The rice plant has no wormhole at the base, no insect feces, easy to pull up the dead heart, and the base and root of the stem are shredded. (2) Locust dead heart. The lower part of the rice plant has insects, wormholes or worms, and the dead heart is easy to pull up. (3) Stripe leaf blight dead heart. The heart of the diseased plant has a yellow stripe and is rolled into a paper-like shape, and the curve is sagging into a "false dead heart." The base has no wormholes, does not rot, and the dead heart is not easy to pull up.
Fifth, the line yo. It is mainly caused by bastard disease. The diseased plants are slender like lines with green leaves and few new roots. There is very little or no childbirth, and it is very small. I can't extend my leaves and die after planting.
Second, the leaves on the spot (1) Flax spots. The lesion initially resembled the size of a needle, and gradually formed an oval spot. It resembled sesame seeds. The color was divided into 3 layers. The outer surface was yellowish halo. The edges were dark brown and the center was gray-yellow. If the light was viewed, there were thin stripes and both ends of the lesion. No necrotic lines. (2) Brown streaks. The base of the midrib of the leaflet firstly occurs, then extends upwards and downwards, stretching like a brown stripe. The diseased part seeps out milky sap, and the diseased strain rots and rot smells. The diseased part is dead in the heart. (3) potassium deficiency. The diseased leaf spot is elliptical or irregularly shaped, but it is not contagious. It mostly occurs after the three-leaf stage and is associated with low temperatures. (4) Rice blast lesions. There are two types of acute type and chronic type. The acute type spot is dark brown, followed by an elliptic spot with gray-green moldy objects on the back; chronic type, spotted spindle-shaped, red-brown on the side, gray on the center, with a brown line running through the middle of the lesion, when wet, on the back Gray mold.
Third, blue and dry (1) physiological blue and dry. The base of the stem is free of insects, disease-free and sterile cores, and it is blighted due to the sudden high temperature and physiological water loss. (2) The disease is blue and dry. Such as Pediococcus sclerotiorum, bacterial base rot disease withered; the former rice plant soft rot, dark brown spots, sheaths and stems are often smaller than the leek seed black sclerotia; the latter peeled off the stem Filled with stinky water, but with a sterile nucleus, the basal gray rat rotten.
Fourth, dry heart (1) è¼è›„ 枯 damage heart. The rice plant has no wormhole at the base, no insect feces, easy to pull up the dead heart, and the base and root of the stem are shredded. (2) Locust dead heart. The lower part of the rice plant has insects, wormholes or worms, and the dead heart is easy to pull up. (3) Stripe leaf blight dead heart. The heart of the diseased plant has a yellow stripe and is rolled into a paper-like shape, and the curve is sagging into a "false dead heart." The base has no wormholes, does not rot, and the dead heart is not easy to pull up.
Fifth, the line yo. It is mainly caused by bastard disease. The diseased plants are slender like lines with green leaves and few new roots. There is very little or no childbirth, and it is very small. I can't extend my leaves and die after planting.
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