Corn fertilizer pay attention to what matters
At present, it is the peak season for corn growth, and it is also the main period for corn dressing. However, many farmer friends have unfavorable responses and top dressing. The analysis may be due to non-standard fertilization techniques. Summarize the five points for corn dressing:
1, see the top dressing. Top dressing depends on the nature of the soil. Low-lying land and alkali land, to use ammonium nitrate, ammonium sulfate, superphosphate and other acidic or physiological acidic fertilizer as top-dressing; acidic soil should use urea, ammonium bicarbonate and other alkaline fertilizers as top dressing, the ability to maintain water, poor fertilizer retention In sandy loam, non-volatile ammonium nitrate or urea should be used as top dressing.
2, see potential fertilizer. Due to the different conditions of soil quality, fertilizer, and water conservancy, although the same variety was planted at the same time, the growing trend was different. There were strong and weak seedling plots, and the corn growth in the same plot was also different. Therefore, there should be a difference when topdressing. The specific method is: topdressing the plots to apply chemical fertilizers; in addition to topdressing the chemical fertilizers, the weak seedlings will also be subject to decomposing manure and cake fertilizers; for the weak seedlings in the strong seedling plots, they should be given a partial eclipse. Top dressing, so that weak seedlings quickly rejuvenate. After cultivating, timely cultivator should be used.
3, see fertilizer and fertilizer. At present, top-dressing corn is habitually dominated by nitrogen fertilizers. After the nitrogen fertilizer is applied to soil, it quickly decomposes into nitrate nitrogen, ammonium nitrogen and amido ammonia nitrogen, and exists in free state. If dressing is too shallow after top dressing, nitrogen will reach the surface, and corn plants can only absorb about 20%. If the depth of application is about 10 centimeters and the soil is compacted and compacted in time, the absorption can reach over 60%. For this feature of nitrogen fertilizers, shallow application, application, or application with water should be avoided to prevent fertilizer waste.
4, see need fertilizer. When the corn seedling grows to 6-7 leaves, the crude fertilizer should be applied according to the strain to induce the early rooting of the tiger root; chemical fertilizer should be applied during the jointing stage, accounting for 30%-40% of the total fertilizer; the fertilization amount at the booting stage should be increased. , accounting for 50% - 60% of the total amount of fertilizer. The topdressing of nitrogen is applied in the early stage; the middle stage foliar spraying of leaf fertilizer No. 2, with an amount of 667 square meters is 0.5 kg; during the solid period, potassium dihydrogen phosphate is sprayed, and the amount of 667 square meters is 150-300 grams.
5, look at top dressing. Seedlings can not be over-fertilized too early, in order to benefit seedlings hair thick and strong; male and female ear formation period, fertilizer should not be too late to prevent premature aging defertilization; timely post-appropriate top-dressing to prevent lust green late.
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