It is believed that there are not many growers who have done so in production. As everyone knows, these are unscientific. First of all, used to top dressing before and after tasseling. At this time, the best time has been missed. When sowing, all the fertilizers are applied as fertilizers, or all the fertilizers are sprinkled when the head water is poured. The amount of waste is increased, and the amount of corn grows less. In the late period, it is prone to premature aging; when it is rain and fertilizer, regardless of the characteristics of corn growth, it is bound to fail to meet the nutritional needs of corn and is not conducive to the development of its potential for yield increase.
At present, the emergence of summer corn is basically over, and spring corn is about to enter a period of rapid growth. Only a reasonable fertilizer application can win the final high yield. Based on the requirement of fertilizer for maize, the seedling stage is the key period for phosphorus and potash fertilizers. The big bell-mouth period before tasseling is the key period for nitrogen fertilizer. The author's part of the doubts when growing fertilizers are summarized as follows:
Q: When is the best time for corn dressing?
Answer: The big bell-mouth period is the best time for top-dressing.
Q: What kind of fat is better? Answer: The use of high-nitrogen, low-phosphorus and medium-potassium or high-nitrogen, low-phosphorus and low-potassium can be selected. Normally, urea can be selected.
Q: Is it better to chase several times? Answer: Under normal circumstances, once on the line, if there are conditions, and the serious shortage of corn, you can also chase several times.
Q: How is it better to top-dress?
A: There are three types of topdressing methods commonly used today: 1. Direct application to the ground; 2. Topdressing and furrowing in furrows; 3. Deep application of artificial grind pits, covering soil. Conditioned artificial grind pits are deep and then covered with soil. If there are many lands, choose the second one, topdressing and covering soil in the furrows to increase work efficiency. The first one is not to choose, serious waste, too little corn absorption.
Q: How much do you need to recover? Answer: Topdressing of corn should be applied according to the soil fertility, the characteristics of the varieties requiring fertilizer, the growth period of the variety, and other appropriate amounts. The plots with lower soil fertility should increase the amount of topdressing, whereas the amount can be reduced appropriately. Taking urea as an example, high fertility plots have a urea dosage of 15 to 17 kg/mu; medium fertility plots have a urea dosage of 18 to 20 kg/mu; low fertility plots have a urea dosage of 21 to 23 kg/mu. If the planting density of corn is large, the amount of topdressing should be increased and can be applied to 35-40 kg.
It should be noted that, in the case of soil drought, it is not recommended to top-dress, it is best to top-dress before the rain. For the greedy and late-maturing plots, phosphorus and potash fertilizers should be added to promote corn maturity as soon as possible.
In addition, while supplementing a large number of elements, we must pay attention to supplement the trace elements needed for crops, so as to greatly avoid the weak seedlings and growth retardation caused by lack of nutrients. At the same time, we can not ignore the comprehensive management. According to the specific growth conditions of the field, drought and watering, do a good job of integrated pest management, timely and late income, to obtain the final increase in production and income.
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