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corn
The fertilizer requirement of corn is 2% of the total fertilizer requirement during the whole growth period , 85% of the earing stage , and 13% of the grain stage . According to the survey, for every 100 kilograms of corn produced , it requires 2.5 kilograms of nitrogen , 0.9 kilograms of phosphorus and 2.2 kilograms of potassium . The peak period of corn fertilizer is from jointing to large flare. Generally, secondary topdressing is carried out, and the first time begins at jointing. 10 acres of urea , or 15 kg of ammonium nitrate , chasing the second fertilizer 7 to 10 days before the tassel , 12 kg of urea per mu or 17 kg of ammonium nitrate , if the soil organic matter content is high, the base fertilizer, the fertilizer foot, Corn grows well, chasing a fertilizer can also be used. The topdressing method can be combined with two times of shovel. It can also be used as a top dresser or a shovel (埯), but the depth of the top dressing must be above 10 cm, so as to improve the fertilizer utilization rate. .
Rice
Rice is more nitrogen fertilizer needed, typically every 100 kilograms of rice seeds as formed, takes about 2 kg of nitrogen, nitrogen absorption is reviving from the start of increasing, tillering fertilizer required to reach the peak, to facilitate Early birth and quick hair, improve effective tillering power, should apply heavy weight fertilizer early to promote tillering. The principle of rice topdressing is to eat less and eat more meals, that is, to apply the tiller fertilizer and the ear grain fertilizer. The time for applying the tiller fertilizer is 7 to 10 days after transplanting, and about 230 kilograms of ammonium sulfate per hectare , and 8 10 before heading. At the leaf stage, the young ears begin to differentiate and begin to apply panicle fertilizer. The panicle fertilizer can be applied in two times. The first time when the inverted 3 leaves are just exposed, about 60% of the total amount of panicle fertilizer is applied to promote the ear and branch. Once the number of spikelets is differentiated, the number of branches is increased, and the number of branches is increased . The second spike is applied at the tip of the flag leaf. The potassium fertilizer is sprayed at the later stage to increase the maturity and 1000-grain weight.
Soy
Fertilizer Law soybean is required to flower emergence 20.4% of the total amount of the whole growth fertilizer requirement, drum granulation flowering to 54.6% Filling 25% to maturity. For every 100 kilograms of soybeans produced , about 5 kilograms of nitrogen, about 1.6 kilograms of phosphorus, and about 3.7 kilograms of potassium are needed. Soybeans need more nitrogen, and their rhizobium can only satisfy the acidity of soybeans, which is 1 / 2 to 1 / 3 of soybeans. nitrogen is a critical period required and flowering stage seedlings, flowering early topdressing nitrogen, clips off the flowers can be reduced, the absorption of phosphate soybean such, the blooming flowers to 15% of the total uptake of the early flowers to junction Phosphorus in the pods accounted for 60% , and the pods to the drums accounted for 25% of the phosphorus . Soybeans required potassium fertilizers to be more than nitrogen fertilizers and more than phosphate fertilizers. The emergence of flowering and potassium uptake accounted for 32.2 %, and the flowering to drums accounted for 61.9 %. Accounted for 5.9 %. Soy dressing: First rhizosphere dressing, when soybean growth is weak, binding two times everywhere shovel, nitrogen fertilizer, topdressing urea per hectare of 45 to 75 kg, earth immediately after the dressing, to prevent evaporation and improve the utilization rate of fertilizer play The second is the top dressing. When the soybean grows weakly in the early stage, it is used in the initial flowering stage of soybean at 10 kg per hectare plus 1.5 kg of potassium dihydrogen phosphate , dissolved in 500 kg of water, and can also be added with trace element fertilizer for foliar application. .
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