fertilizing winter wheat is skillful, not just by putting chemical fertilizer into the field, it will grow good crops. fertilizing time is also very important. so when is the right time to fertilize winter wheat in spring? what are the time and techniques of fertilization? let's have a look.
when fertilization is suitable for winter wheat in spring, winter wheat enters the green stage after spring, followed by tillering stage to jointing stage. these two growth stages are very critical for high-yield winter wheat. the period from green-turning to flag-picking of winter wheat is the spring growth stage, which generally lasts 50-60 days, and is the key period for yield formation. spring topdressing of jointing and booting fertilizer is the key to promote the transformation of wheat seedlings and healthy growth, and also an important measure to ensure high and stable yield.
fertilization techniques for winter wheat in spring fertilizer application in wheat field in spring should be based on increasing organic fertilizer application, rational application of chemical fertilizer, increase fertilizer utilization rate and reduce soil pollution. in general, high-yielding fields control nitrogen, stabilize phosphorus, increase potassium and supplement, middle-yielding fields stabilize nitrogen and increase phosphorus, and supplement potassium fertilizer.
from the physiological point of view of wheat, it is the most advantageous period to consolidate strong seedlings before winter, strive for weak seedlings to grow stronger and inhibit vigorous seedlings growth that the plants continue to tillering, leaf emergence and rooting, and start young spike differentiation from the stage of greening to rising. therefore, it is necessary to adopt different fertilization measures according to different types of wheat fields. see seedling fertilization can be summarized in three words: protection, promotion and control.
in a wheat field that had reached the goal of "six leaves and one heart", four or five tillers, a total stem of about 800,000 per mu, strong plants, normal leaf color and no yellowing when overwintering a year ago, do not apply fertilizer and water immediately after turning green, in order to prevent overgrowth and excessive consumption of nutrients, which is not conducive to later high yield. in order to ensure effective tillering and safe growth before the year, this kind of wheat field should adopt such measures as hoeing, weeding and pest control, which is conducive to improving the earing rate of wheat and laying a good foundation for high yield of wheat in later period.
the main field measures are to "protect" wheat before and after jointing stage, and then apply fertilizer and water. this is also the so-called nitrogen backward transfer fertilization method, which is conducive to high yield of wheat.
years ago, wheat fields were planted too late, with poor fertility conditions and insufficient base fertilizer; wheat seedlings were short and tillers were few in winter; three types of wheat fields with weak plants, yellowing leaves and less than 400,000 stems per mu were planted when returning to green; or wheat fields with straw returning to the field without overwintering water, loose and permeable soil, strong evaporation of water, drought of soil and the phenomenon of wheat seedlings hanging roots should be watered back to green water and applied green fertilizer in time.
it should be emphasized that it is very important to select the right fertilizer for this kind of wheat seedlings. first, do not use organic fertilizer or less. as the saying goes: fertilize the land, fertilizer seedling. because of the low temperature in early spring, the decomposition of farm manure is slow, which can not meet the needs of wheat for nutrients. secondly, quick-acting chemical fertilizers should be applied, because the fertilizer is efficient and can supply the needs of wheat growth and development in time. urea can be applied 10-15 kg per mu, and green water can be irrigated well. on this basis, foliar fertilizer can be sprayed once to promote new roots, cold resistance, drought resistance and disease resistance, which is conducive to the transformation of weak wheat seedlings into strong seedlings. thirdly, when applying fertilizer, we should also pay attention to the weak seedlings in some high-yielding fields, and apply eccentric fertilizer to make the growth of the whole plot consistent, which is conducive to increasing wheat yield.
years ago, sowing too early, sowing too much, there appeared a long wheat, because of early ridge closure, leaf spread, leaves too thin, after green, they should adopt "control" measures, more rowing hoe, try not to water, squat seedlings. in addition, we should pay close attention to whether there is freezing damage. if there is freezing damage, we should take appropriate measures.