How to fertilize correctly in spring? What issues should be paid attention to when fertilizing in early spring? It is reported that every year after the beginning of spring, wheat turns green and fruit trees germinate and bloom. Spring fertilization is required at this time. If fertilization is unscientific. It will cause serious waste and affect crop yields.
How to fertilize correctly in spring
Suitable fertilization selection
The conversion of compound fertilizer and urea is slow in spring when the ground temperature is low, and it takes about 25 days, and its fertilizer effect is about 60 days. After the application, in May, the flowering period of wheat needs to stagnate, and the growth of fruit trees needs to stop. The grapes are also just after the flowering period and do not require nitrogen fertilizer or they will fall. However, at this time, the compound fertilizer and urea just play the role of fertilization, so fruit trees cannot Stop growing at the right time and the sliver is long. This is a clear proof that when urea is sprinkled, the sliver is handful, and the urea is touched, there is no flower on the tree. Reasonable fertilization time, correct fertilization method, correct fertilizer type, and correct content are the correct choices.
Nitrogen fertilizer needed in the early stage
It takes a lot of energy for crops to sprout and flower in early spring. Nitrogen fertilizer is the main component of protein in crops, and it is a component of chlorophyll and enzymes. After the true leaves of crops sprout, they will begin to absorb nitrogen fertilizer, and during the flowering period, they consume Nutrients account for about 70% of the reserve nutrients. After flowering, the branches grow, the fruit is set, and the young fruit cells divide, and a lot of nutrients are needed. This makes the reserve of nutrients far from enough, so it is necessary to add fertilizer once before flowering and germination.
Nitrogen fertilizer is effective when supplemented in time
Nitrogen fertilizer should be used in the critical period and efficiency period of crops. Different crops have different critical periods and efficiency periods. Therefore, they should be treated differently and applied reasonably.
For example, the critical period of nitrogen requirement for gramineous crops such as wheat and corn is in the tillering stage and ear differentiation stage, and in the bud and boll stage of cotton. In the nitrogen efficiency period, wheat is in the jointing to booting stage, rice is in the tillering to the jointing stage, corn is in the bell mouth stage, tomato is in the fruiting stage, cabbage is in the rosette stage, sunflower is in the bud stage, and soybean is in the initial flowering stage.
Precautions for fertilizing in early spring
Use water-soluble fertilizer in early spring
Take fruit trees as an example. During the growth process, fruit trees grow early, stop early and accumulate, which is beneficial to the formation of flower buds of fruit trees. The stronger the germination of fruit trees in spring, the more spring shoots and the longer they grow. Stop early.
Observing fruit trees, we can know that the more growth points, the earlier the fruit trees will stop growing, and the fewer spring shoots on the tree, but the longer it will stop growing. Even some slivers will not stop growing without the junction of spring and autumn shoots. This is called Blind section. Therefore, if you want to make fruit trees grow early and stop early, you must have nutrients in spring. The fertilizer effect period of spring topdressing should not be too long, otherwise the branches will grow continuously, which will affect the differentiation of flower buds and fruit expansion. Generally speaking, the effect period of topdressing fertilizer should not exceed 20 days. Generally, compound fertilizers have a longer effective period than this. Water-soluble fertilizers are more conducive to the absorption of fruit tree roots, faster, fruit tree topdressing is stronger, and base fertilizer is slower, so water-soluble fertilizer is more suitable for topdressing.
Pay attention to applying urea in early spring
The thalidomide nitrogen of urea cannot be directly absorbed by crops. It must be converted into ammonium nitrogen by the action of microorganisms in the soil before it can be used. At a temperature of 10℃, the conversion time takes 7-10 days, and at 20℃ it takes 4- In the early spring, the ground temperature is generally low and the transformation time is longer. It may not keep up with the critical period and efficiency period of crops. This not only causes waste, but also causes later lodging, flourishing, and affecting flowering and fruit setting.