First, the symptoms 1. Nitrogen deficiency: The plants are small, thin and thin, yellow, and later fall off leaves. 2. Phosphorus deficiency: Plants growing slowly in seedling stage are thin, adult plants lack phosphorus, dark green leaves, black tips or dead leaves, stagnate growth, and defoliation from the lower part, no results. 3. Potassium deficiency: Symptoms appear at the flowering stage, the plants grow slowly, the leaf margins turn yellow, and the leaves easily fall off. In the adult stage, there is a lack of potassium, and the lower leaves have yellow tips. Yellow spots are formed along the leaf margins or veins. The leaf margins gradually dry out, extending inwards to the entire leaf as burning or necrotic; the leaves from the old leaf to the heart From the tip of the leaf to the petiole, the plants are susceptible to dehydration and wither, and the fruit is small and easy to fall. 4. Calcium deficiency: Calcium deficiency during flowering, plant dwarf, yellowing of parietal lobe, lower part still green, dead or near growth point of growth point, brown and rot in the lower part of fruit; late calcium deficiency, yellowish-white circular spots on leaves The edges are brown and the leaves fall off from above and below. The whole plant grows with light stems, and the fruit is small and yellow, producing rot and fruit. 5. Sulfur deficiency: Plants grow slowly, branch more, stems are hard and lignified, yellow-green leaves are stiff, and little or no result. 6, zinc deficiency: plants are short, the top lobular clumps, growth retardation, leaf deformity is small, leaf curling shrinkage, browning stripe, the occurrence of top dry, within a few days leaves yellow or fall off. Second, the cause 1. Before the nitrogen deficiency, application of organic manure or nitrogen fertilizer is low, nitrogen content in the soil is low, rainfall is high, and nitrogen is leaching more. 2, phosphorus deficiency seedlings encounter low temperatures, soil acidity or tight. 3. Potassium-deficient soil contains low potassium content or sandy soil. The fruit enlargement in the middle of growing period requires more potassium, and the supply is insufficient. 4, calcium deficiency application of nitrogen fertilizer, potassium fertilizer will be too much, the soil is dry, high concentration of soil solution, air humidity is small, rapid evaporation, water is not timely or lack of calcium on the acidic soil. 5. Sulphur-deficit fertilizers without sulfate for a long period of time. 6. Boron-deficient soil acidification, boron leaching or excessive application of lime. 7, iron deficiency in the soil more phosphorus, partial alkali affect the absorption and operation of iron. Third, control methods 1. Apply compost or fully mature organic fertilizer when nitrogen is lacking, adopt formula fertilization. The application of nitrate nitrogen is better. According to the pepper seedling stage, early fruit stage and full fruit period and other periods of fertilization. 2. Phosphate fertilizer should be applied in the period of phosphorus deficiency seedling and planting. Phosphorus pentoxide is required in the culture soil, and potassium dihydrogen phosphate or superphosphate can also be sprayed on the leaves. 3, potassium deficiency in the application of organic fertilizer on the basis of sufficient potassium fertilizer can be applied potassium sulfate, grass ash, coated soil after application, can also be spraying potassium dihydrogen phosphate. 4. Calcium-deficient application of appropriate lime, foliar spray of water-soluble calcium every 3 to 4 days in emergency, in addition, application of plant growth regulator (brassica lactone). 5. Sulfur-containing fertilizers such as ammonium sulfate are used for sulfur deficiency. 6, boron-deficient foliar spray borax aqueous solution. 7, zinc deficiency soil can not apply excessive phosphorus, spraying zinc sulfate aqueous solution. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone All our high visibility workwear are produced strictly according to standards European EN13688,EN ISO20471, EN343, EN11611, EN11612, EN1149; American ANSI/ISEA 107-2015, Canadian CSA Z96-15 and Australian AS/NZS 1906.4, AS/NZS 4602. hi vis polo shirts,hi viz shirts,high vis shirt,hi vis safety shirts Ningbo Staneex Imp. & Exp. Co., Ltd. , https://www.staneex.com
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