With the continuous introduction of high-quality agricultural hybrids and the improvement of cultivation levels, the grain yield per mu is constantly refreshing. In the 1950s, due to the lack of nitrogen fertilizer, the grain yield was increased. The application of nitrogen fertilizer made the grain output increase significantly. In the 1960s, experts in-depth research on the lack of soil phosphate fertilizer, due to the supplement of grain yield of nitrogen fertilizer and phosphate fertilizer, “cross the Yellow River, crossing the Yangtze River In the 1970s, potassium fertilizer in the soil became the least nutrient, and the application of potassium fertilizer became the key to increase production. Since then, nitrogen, phosphorus and potassium fertilizers have been widely recognized and scientifically applied in agricultural production. Expert research shows that since the 1980s, the balance of trace elements such as zinc, molybdenum, manganese and calcium in China's soil has become the bottleneck for the peak of grain production. Therefore, in recent years, the state has increased investment in agriculture, and agricultural technology promotion departments at all levels have continuously introduced new measures such as “balanced fertilization†and “soil testing and fertilization†to ensure stable and high-yield grain production.
At present, zinc deficiency in food crops has become a very prominent problem. The reduction of production or even the harvest of crops due to zinc deficiency in the soil has occurred. Especially the zinc deficiency of large grain crops such as corn, rice and wheat has become more and more serious, affecting yield and Food security.
The main symptoms of zinc deficiency in crops are:
1 Zinc deficiency in maize caused albino seedlings in the seedling stage, causing streaked flower petiole in the middle stage, resulting in the lack of grain and baldness in the ear, which seriously affected the yield. 2 The zinc deficiency seedling stage caused the yellow sorghum seedlings, the plants were short, no tillering or less tillering, and the growth was uneven; the leaf cycle was long, the tip of the leaf curled inward, the old leaves were not hanging, the roots were short, the growth was slow, and the growth was not Wang, the leaves are orange-yellow; zinc deficiency from jointing to booting stage will aggravate the occurrence of sheath blight; zinc deficiency in the middle and late stages will cause infertility of florets, delay in maturity, and significant reduction in yield. 3 Zinc deficiency in wheat caused white-green streaks or bands on both sides of the veins at the seedling stage. The internodes were short, the heads and flowers were late, and the flowers were not neat.
Specific methods for crop zinc supplementation :
1 corn, 5 to 10 ml of 75% Kangpu suspended zinc, seeded with seed dressing, 10 kg of seed dressing or 10 kg of seeded with equal amount of water; 75% Kangpu suspended zinc 3000 times solution at seedling stage to jointing stage or 25% zinc multi-powder 1000 times solution is sprayed once every 7 to 10 days, and even sprayed twice.
2 rice, first use 5 ml of 45% chlorpyrifos EC or 25% of Schaum emulsifiable concentrate 10 ml plus love to add 5 ml of water to 25 kg of soaking seeds for 5 to 7 days, add 75% to 24 to 48 hours before the end of soaking 10 ml of suspended zinc, no need to clean after soaking, direct germination sowing; 2 to 3 days before transplanting, then spray with 75% Kangpu suspension zinc 3000 times solution or 25% zinc powder 1000 times solution to make the seedlings with zinc Shimoda; in the tillering period, use 35% zinc multi-granules 200-250 grams to spread Honda with topdressing.
3 Wheat, every 10 kg of wheat seeds were seeded with 5 to 10 ml of 75% Kangpu suspended zinc before sowing; during the growth period, 75% of Kangpu suspended zinc 10 ml of 3000 times solution was used for spraying the stems and leaves.
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