Corn reasonable fertilization at a glance

2019-12-04 02:03:05

Applicable area: Technical points for corn planting areas in Sichuan disaster area: Determine the amount of fertilizer according to the target yield. High-yield plots of pure nitrogen (N) 12-16 kilograms, pure phosphorus (P2O5) 4-6 kilograms, and pure potassium (K2O) 5-6 kilograms per acre; medium and low yield plots of pure nitrogen (N) 10-ha per hectare 13 kg, 3-5 kg ​​of pure phosphorus (P2O5) and 4-6 kg of pure potassium (K2O). Promote the use of soil testing formula fertilization card to guide fertilization.

Seedlings promote seedlings. Most of the summer corn in this area is interplanting. Appropriate application of seed fertilizer at the time of sowing can promote early rapid growth of corn and guarantee seedlings and seedlings. Fertilizers are generally dominated by nitrogenous fertilizers and phosphate fertilizers, supplemented by some trace elements. It is best to use diammonium phosphate, a small amount of potassium fertilizer as a fertilizer, the amount of 3-4 kilograms per hectare. Note that urea should not be used as a fertilizer.

Nitrogen fertilizer application by stages. 2/3 of the total amount of nitrogen fertilizer is used as top dressing. Summer maize fertilization should be the key period of fertilization with five leaf extensions and ten leaf extensions, ie "small bell-mouth period" and "big bell-mouth period", and the distribution of nitrogen fertilizer should be 1:2 or 1:3. Top-dressing depth is 8-10 cm.

Potash fertilizer is applied. Appropriate increase of potassium fertilizer at late growth stage of summer corn can ensure that summer corn can be grouted and increase yield, and farmland without straw returning field is more necessary. It is generally applied during the 10-leaf summer corn (large bell-mouth period).

Apply slow-release fertilizer. Summer corn is difficult to fertilize in the later period. Slow and controlled release fertilizer is used to reduce field operations by using a single fertilization technique at the seedling stage. Fertilizer utilization is also improved. The amount of slow-release fertilizer is based on the effective content.

Spray foliar fertilizer. If late defertilization occurs, a 1% urea solution can be used for foliar application; late glutinous green late maturity is performed with 0.2% potassium dihydrogen phosphate for foliar application to promote premature maturation of corn.

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