1. Look at the soil and topdress. Topdressing depends on the nature of the soil. For low-lying land and alkali, acid or physiological acid fertilizers such as ammonium nitrate, ammonium sulfate and superphosphate should be used as top dressing; acidic soil should use alkaline fertilizer such as urea and ammonium bicarbonate as top dressing, which has poor water retention and fertilizer retention capacity. For sandy loam, non-volatile ammonium nitrate or urea should be used as top dressing.
2, look at the trend of topdressing. Due to different soil, fertilizer and water conservancy conditions, although the same variety is planted at the same time, the growth is different, there are strong seedling plots, and there are also weak seedling plots, which is the difference in corn growth in the same plot. Therefore, there should be a difference in topdressing. The specific method is: the seedling block is chased with chemical fertilizer; in addition to the fertilizer application, the weak seedling block should also be followed by the decomposed manure and cake fertilizer; for the weak seedlings in the strong seedling block, the partial eclipse should be given. Topdressing, so that weak seedlings quickly rejuvenate. After the top dressing, it is necessary to cultivate in time.
3, see fertilizer fertilization. At present, corn topdressing is customarily based on nitrogen fertilizer. After being applied to the soil, the nitrogen fertilizer is quickly decomposed into nitrate nitrogen, ammonium nitrogen and amido nitrogen, and is present in a free state. If the soil is too shallow after top dressing, the nitrogen will reach the surface layer, and the corn plant can only absorb about 20%. If the application is about 10 cm deep and the soil is compacted in time, the absorption can reach more than 60%. In view of this characteristic of nitrogen fertilizers, shallow application, clear application or application with water should be avoided to prevent waste of fertilizer.
4, look at the need for topdressing. When the maize seedlings grow to 6-7 leaves, the fertilizer should be applied according to the plant, and the roots of the tiger roots should be induced; the fertilizer should be applied at the jointing stage, accounting for 30%-40% of the total topdressing amount; the amount of fertilizer applied at the booting stage should be increased. , accounting for 50% - 60% of the total fertilization amount. Nitrogen was applied in the early stage; the leaf foliar application of the leaf fertilizer No. 2 in the middle stage, the amount of 667 square meters was 0.5 kg; the potassium dihydrogen phosphate was applied during the fruiting period, and the amount of 667 square meters was 150-300 g.
5, look at the topdressing. In the seedling stage, it is not possible to topdress the fertilizer too early, so that the seedlings are thick and strong; the male and female ears are formed, and the topdressing should not be too late to prevent premature aging; the late topdressing should be timely and appropriate to prevent late maturity.
This article URL: What are the precautions for northern corn planting and topdressing?
Grape Seed Extract Powder,Grape Skin Extract Powder,Hyaluronic Acid Sodium,Pine Bark Extract Capsules
Ningbo Nutrition Food Technology Co.,ltd. , https://www.collagenworkshop.com