Applying Topdressing to Crops This Way Can Effectively Increase Yield
How can crops be topdressed to increase yield? Please introduce the methods. Topdressing crops is an important means of achieving increased production and income, but topdressing must be done scientifically to achieve a bumper harvest. Three considerations: determine the type of chemical fertilizer to apply based on differences in soil pH. In general...
How can crops be topdressed to increase yield? Please introduce the methods
Topdressing crops is an important means of achieving increased production and income, but topdressing must be done scientifically to achieve a bumper harvest.
Three considerations:
Determine the type of chemical fertilizer to apply based on differences in soil pH. In general, for low-lying alkaline land, acidic fertilizers such as ammonium sulfate should be chosen; for acidic soil, alkaline or neutral fertilizers such as urea, ammonium bicarbonate and ammonia water should be applied; for sandy soil and sandy loam with poor water- and fertilizer-holding capacity, fertilizers that do not volatilize easily, such as ammonium chloride and urea, should be applied. At the same time, during the topdressing period, it is best to increase the number of topdressing applications and reduce the amount applied each time, to prevent fertilizer volatilization and loss.
Treat fertilizers differently according to their properties and composition. Mixing ammonium chloride with urea and applying it to paddy fields can inhibit nitrification and reduce leaching loss, but it must not be used in saline soil, to avoid chloride accumulation in the soil and aggravating salt damage. At the same time, it must not be applied to chloride-sensitive crops such as tobacco, sugar beet and potato, to avoid reducing their yield and quality; urea is suitable for all kinds of crops and all types of soil, but it must be transformed in the soil before its fertilizer effect is released and absorbed by crops. Therefore, when using urea as a topdressing, it should be applied several days earlier than other nitrogen fertilizers, and applied deeply with soil covering to improve fertilizer efficiency.
Prescribe the right remedy according to the type of crop and supply according to need. For example, corn needs relatively more nitrogen fertilizer; relying only on base fertilizer and seed fertilizer often cannot meet the crop's nitrogen needs, so a certain amount of nitrogen fertilizer must also be supplemented in a timely manner; soybean is also a crop that needs relatively more nitrogen fertilizer, and root nodule nitrogen fixation can only meet about 50% of the nitrogen fertilizer needed by soybean throughout the entire growth period, so timely nitrogen topdressing has a very good effect. Sunflower (4.060,-0.10,-2.40%) has a tall plant, deep roots and a large flower head, so the amount of fertilizer it needs is also somewhat higher than that of gramineous crops, and urea can be applied as topdressing.
One mastery:
Master the needs of various crops during the critical period and the period of maximum efficiency of nutrients, and carry out topdressing during the peak nutrient period. Early topdressing of wheat has an obvious yield-increasing effect; nitrogen fertilizer should be applied once at the 3-leaf stage to lay a good foundation for cultivating strong seedlings and forming large heads; soybean can be topdressed with nitrogen fertilizer twice at the initial flowering stage, which can reduce the rate of flower and pod shedding, prolong the life of the plant, and increase grain weight and yield; for corn, the period from after jointing to the large trumpet stage is the peak period of nutrient uptake, so the second fertilizer application should be made, and the second fertilizer application should be made before heading; rice should be topdressed once each at the reviving, jointing and heading stages; sunflower can be topdressed at the squaring stage.
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