Detailed Explanation of Key Points of Black Soybean Planting and Fertilization Techniques
Black soybean is a type of soybean, also known as horse bean, winter bean, and black soybean, named for its black seed coat. Besides being edible, it also has extremely high nutritional value. As its planting area expands, do you know its fertilization methods? Come and take a look at the detailed introduction with the editor.
1. Apply sufficient base fertilizer
When fertilizing the soil, black soybean, with the nutritional foundation from the early stage, can meet its nutritional needs before the flowering period, so as to emerge and grow strong seedlings as early as possible. The base fertilizer is mainly organic fertilizer. Generally, for plots with medium or insufficient fertility, 1000-1500 kg of decomposed organic fertilizer can be applied per mu; while for plots with sufficient fertility, 500-1000 kg of decomposed organic fertilizer per mu is enough. In addition, nitrogen, phosphorus, and potassium fertilizers should be reasonably combined. Generally, 8-10 kg of diammonium phosphate and 10 kg of potassium sulfate are applied per mu. When fertilizing, it can be applied into the bottom of the ridge together with land preparation, or applied beside the seeds when sowing, but it should not directly contact the seeds to avoid burning roots and killing seedlings.
2. Timely topdressing
After applying sufficient base fertilizer in the early stage, topdressing is generally not needed, but after black soybean blooms, the demand for fertility is extremely high, so timely topdressing is required at this time. Topdressing should also be determined according to the soil fertility status, the type of seed fertilizer, and the growth of black soybean. Generally, for plots with average fertility, 3-5 kg of urea or 6-10 kg of ammonium sulfate can be applied per mu at the initial flowering stage. The fertilizer can be spread beside the plants and buried together with intertillage and weeding. For plots with sufficient fertility, if the plants grow vigorously, nitrogen fertilizer may not be applied to avoid excessive vegetative growth, and some phosphorus and potassium fertilizer can be appropriately applied to increase the plants' resistance to diseases and lodging. For poor fertility plots, topdressing is needed at the seedling stage, generally applying 8-10 kg of diammonium phosphate per mu to promote seedling growth.
3. Foliar topdressing
The leaves of black soybean have strong absorption capacity and can absorb fertilizers and trace elements. During the flowering and pod-setting period of black soybean, the demand for fertility is extremely high. When soil nutrients are insufficient or root absorption is weak, the foliar topdressing method can be used. Foliar topdressing uses a small amount but has quick fertilizer effect and can solve the plant's urgent need for fertilizer. The types of foliar topdressing include urea, potassium dihydrogen phosphate, potassium sulfate, ammonium molybdate, borax, zinc sulfate, etc. When carrying out foliar topdressing, attention should be paid to the concentration. Generally, the concentration of nitrogen, phosphorus, and potassium is about 1%, while the concentration of micro-fertilizers is about 0.01%. It can be sprayed 2-3 times from the initial flowering stage to the pod-filling stage of black soybean, with an interval of about 10 days each time.
The above is an introduction to black soybean fertilization techniques. I hope it can help you. To learn more related knowledge, please keep following us.