(1) For spring corn, the primary approach to fertilization is through basal fertilizer, with top-dressing as a supplement. Organic manure is typically used alongside chemical fertilizers, with nitrogen being the main component and phosphate acting as a secondary nutrient. The general principle is to apply panicle fertilizer primarily, with grain fertilizer as an additional supplement. Basal fertilizers should make up approximately 70% of the total fertilizer application. Most of the phosphate fertilizer should also be applied during this stage, ideally combined with autumn plowing in the first year. When applying basal fertilizer, it should be evenly mixed into the soil to ensure optimal nutrient availability. A typical rate is 37.5 to 60 tons per hectare. If using nitrogen-based fertilizers as a base, 375 kg of ammonium bicarbonate or 150 kg of urea per hectare can be applied. It's important to incorporate it deeply into the soil to minimize nitrogen loss due to volatilization. In soils deficient in phosphorus, 450–600 kg of calcium phosphate per hectare is recommended. For potassium-deficient soils, 150 kg of potassium chloride is advised, while 15 kg of zinc sulfate per hectare is suggested for zinc-deficient soils.
(2) Before sowing in spring, a small amount of farmyard manure is used along with an appropriate quantity of nitrogen and phosphate fertilizers to serve as seed fertilizer for corn. This helps provide essential nutrients right at the early growth stage.
(3) Top-dressing is a critical practice for achieving high yields in corn cultivation. Due to the long growing period and slow early growth of spring maize, which limits nutrient uptake during the seedling stage, the "light before and heavy after" method is commonly used. This involves applying one-third of the top-dressing before the maize reaches the jointing stage, using 75–150 kg of urea per hectare. The remaining two-thirds are applied during the large whorl stage, with 150–300 kg of urea per hectare. This timing ensures sufficient nutrients for the critical stages of ear development, including spikelet and floret differentiation and grain formation. Research has shown that this method increases yield by 13.3% compared to the "heavy before and light after" approach, making it a more effective strategy for maximizing corn production.
Frozen CPDTO Red Shrimp
Frozen CPDTO red shrimp
Cpdto Shrimp,Cpdto Red Shrimp,Frozen Cpdto Red Shrimp,Delicious Cpdto Red Shrimp
Zhoushan Junwei Aquatic Products Co., Ltd. , https://www.junweiaquatic-intl.com