At present, wheat is in the overwintering period, and someone has published a technical article on spring fertilization of wheat, introducing the measures of wheat fertilization next spring. Over the years, friends who have adopted the "bombardment" fertilization method have some questions after seeing these articles, so they asked me, when will it be good to top fertilize next spring?which fertilizer to use, etc. I would like to share my personal opinions on these issues for your reference.
Why should wheat be topdressed in spring?
In most areas of the winter wheat area north of the Huai River, farmers plant wheat, most of them adopt the "bombardment" fertilization method, which is also a farming habit, and all the fertilizer to be applied is applied as the bottom fertilizer when planting in autumn, and no top dressing is left. They believe that fertilizer is more useful when applied to the field for the growth of wheat than at home. In addition, topdressing takes a lot of time and labor, requires a lot of expenses, and will delay making money by doing it yourself, it is also an investment, it is better to save labor and money by fertilizing once, due to these understandings and actual conditions, planting land is used once fertilization.
Are there any drawbacks to fertilizing at one time?Yes!Definitely!The disadvantage is that the wheat grows vigorously before the year, because the temperature is suitable after wheat sowing, the soil moisture and nutrients are sufficient, the wheat grows in a superior environment, and it is very common to form a vigorous growth. In addition, due to the vigorous growth before the year, it is easy to lose fertilizer during the jointing period after the year. This is due to the result of the fertilizer effect, so there will be a small ear, not full grains, and the yield can not be improved.
Therefore, a bombardment plot should be supplemented with fertilizer in the spring to achieve high or higher wheat yields.
When is the top dressing of spring wheat?Which kind of fat is good to chase.
According to the comprehensive consideration of wheat seedling conditions, soil fertility and weather and other factors, wheat topdressing after the year is divided into the following situations:
The first is a strong seedling field: 80 1 million seedlings per mu, wheat leaves are straight, the leaf color is green and yellow, and the plants are delicate. The topdressing time of this kind of field is placed after the wheat jointing, when the first internode of wheat is fixed and the second internode is elongated. It can not be topdressed too early, too early can easily cause the plant to grow and bury the hidden danger of lodging. This kind of wheat field due to the sufficient bottom fertilizer, a large number of elements of nitrogen, phosphorus and potassium are not lacking, can be supplemented with compound fertilizer to promote large ears and grains, generally about 20 catties per mu, fertilization method using fertilization cocoon deep application. After this kind of wheat is flowered, foliar fertilizer is sprayed to promote grain weight, and it is generally no longer topdressed.
The second is the wheat field of Wang seedlings: the total number of stem tillers per mu is more than 1 million seedlings, the leaves are large and thin and draped, and the leaf color is dark green. This kind of field is divided into two situations, the field of defertilization, that is, the leaf color is yellow and the plant is weak, this kind of field is based on the use of cultivated roots, chasing urea 15 catties per mu after wheat gets up, promoting the rapid growth of large tillers, the death of small tillers, entering polarization in advance, promoting tillers into large spikes, and reducing the spikelet rate.
Moreover, the real vigorous seedlings should be postponed fertilization time, and then top dressing after the second internode of wheat is fixed, using phosphorus and potassium compound fertilizer, about 20 catties, to promote the number of grains and grain weight.
The third is the weak seedling field, the number of stem tillers per mu of this kind of wheat is less than 700,000 seedlings, the leaves are small and thin, and the leaf color is slightly yellow. Top dressing should be highlighted early, the use of fertilizer to fast-acting fertilizer-based, the use of high nitrogen compound fertilizer or urea, to promote the rapid growth of plants, top dressing should be before returning to green, after the soil thaws, 30 kg of urea per mu or 40 50 kg of compound fertilizer.
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