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What are the supplemental lighting methods for greenhouse strawberries in winter
Light is an important factor limiting the yield and profitability of greenhouse strawberries. When light is insufficient, it not only affects the normal growth and development of strawberries, but also directly affects the temperature, humidity and carbon dioxide concentration inside the greenhouse. Especially in winter, adverse weather all affects
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Analysis of Limiting Factors in Cotton Production and Countermeasures (Part 2)
7. Main symptoms of premature senescence: First, after the peak boll-setting period of cotton, the leaves show interveinal chlorosis and yellowing; the yellowing leaves begin at the point farthest from the main stem and develop from top to bottom and from outside to inside, and the leaves gradually dry up and fall off. Second, in the late growth stage of cotton, the leaves turn red and lose their function of producing nutrients. The earlier the premature senescence of cotton appears, the more severe the yield reduction. Causes: First, the soil is poor and the soil fertility is insufficient. The soil nutrients cannot meet the requirements of cotton growth and development; second, fertilization is insufficient. In particular, potassium fertilizer and nitrogen fertilizer are insufficient, and some cotton farmers fear that when the amount of nitrogen applied is large, it will cause
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