How to prevent peanut deficiency
In peanut production, one of the reasons for the low yield is due to the lack of peanuts. For this reason, to seize high yields, we should be alert to the deficiency of the disease.
First, the symptoms of a lack of nitrogen. The leaves are light yellow and the leaves are small, affecting the formation of fruit acupuncture and the development of pods. Redness of stems, less nodule, poor plant growth, and few branches. The second is the lack of phosphorus. Dark green leaves, thin stalks, purple color, less nodule, less flowers, fruit dysplasia. The third is the lack of potassium. The color of the first leaves was slightly darkened, followed by yellow spots on the tips of the leaves, and light brown spots on the posterior leaves. The resulting leaf margin is scorched, the veins remain green, and the leaves are susceptible to dehydration and curling, with few or abnormal pods. The fourth is iron deficiency. When the iron deficiency leaves the leaf chlorosis, severe veins also bleed. Five missing manganese. The early veins appear gray-yellow, and in the later stages of growth, the green part is bronzed and the veins remain green, not as obvious as soybeans. Six lack calcium. Pod development is poor, affecting the development of kernels and empty fruit. Calcium deficiency often forms "black embryos." Calcium deficiency results in less gum material, and the shell is not dense and easy to rot. When the calcium deficiency is severe at the seedling stage, the leaf surface is chlorotic, the petiole off or growing point is wilting, and the roots are not differentiated. Seven deficiency magnesium. The top leaf veins are chlorogenic and the stems are dwarf. A severe deficiency of magnesium can cause plant death. Eight lack of sulfur. Symptoms are similar to nitrogen deficiency. However, in the absence of sulfur, the top leaves are usually yellowed (or chlorotic), and in the absence of nitrogen, yellowing of the old leaves or yellowing up and down is the first step. Nine deficient boron delayed the flowering process and the capsule development was inhibited. Causes seed kernels to be "hollow" and affects quality.
Second, control methods
1, the prevention and treatment of nitrogen deficiency is full of organic fertilizer. The second is the inoculation of rhizobia, increasing phosphorus fertilizers to promote their own nitrogen fixation. The third is to apply 5-10 kg of ammonium sulfate at 667 m2 for 10 days before flowering, preferably 15-20 days after application of organic fertilizer.
2, to prevent the lack of phosphorus per 667m2 with calcium superphosphate 15-25kg mixed with organic fertilizer brewed 15-20 days as base fertilizer or seed fertilizer concentration ditch application.
3, to prevent the lack of potassium First, the use of plant ash 150kg, the second is 667m2 with potassium chloride or potassium sulfate 5-10kg. If necessary, apply 0.3% potassium dihydrogen phosphate to the foliage.
4, to prevent iron deficiency is based on the base easily soluble ferrous sulfate, iron content of 19% -20%, 667m2 applied 0. 2-0. 4kg, preferably with organic fertilizer or mixed calcium phosphate. The second is soaking with 0.1% ferrous sulfate aqueous solution for 12 hours. The third is to spray 0. 2% aqueous ferrous sulfate solution in the flowering stage or in the scab stage, once every 5-6 days, spraying 2-3 times continuously.
5, to prevent the lack of manganese is best to use 23% -24% easily soluble manganese sulfate per 667m21-2kg base fertilizer, if necessary, can be 0. 05% -0.1% manganese sulfate solution soaked or foliar spray, every 7- Spray it once more in 10 days.
6. Prevent calcium-deficient acid soil from applying appropriate amount of lime and calcareous soil. Apply appropriate amount of gypsum (calcium sulfate). Calcium sulfate is a kind of physiological acidic fertilizer. It can also be used to improve saline-alkali soil in addition to supply of peanut calcium and sulfur. 667m250-100kg, can also be applied at the flowering stage, about 667m225kg, if necessary, with 0.5% calcium nitrate foliar spray.
7, to prevent magnesium deficiency when necessary spraying 0.5 solution of magnesium sulfate.
8, to prevent the lack of sulfur properly applied ammonium sulfate or sulfur superphosphate.
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