From the point of view of soybean requirement fertilizer, soybean differentiation from flower bud to initial flowering stage is a period of vegetative growth and reproductive growth, and it is also a time when soybean plants need a lot of nutrition. Under high-yield cultivation conditions, soil fertility alone and applied basal and seed fertilizers often fail to meet the requirements. The production practices in various places have proved that there is a clear effect of increasing topdressing during the period from soybean branching to initial flowering. In particular, the soil fertility is low, and the early growth of soybeans is thin, and the ridges cannot be sealed. The effect of top dressing is even more pronounced. Soybean yields 75 kg of urea and 37.5 kg of potassium sulfate per hectare, which can increase soybean production by 21.9%. However, in the case of more fertile soil, or in the case of basal fertility and seed fertilizer, soybean plants will grow vigorously. When they are relatively luxuriant, they are not suitable for root dressing, and nitrogen topdressing is not suitable. Otherwise, it will cause lodging and yield reduction. Fertilizers can be used as quick-acting fertilizers, such as urea, ammonium nitrate, potassium sulfate, and potassium chloride. Soybeans are top-dressed at the beginning of the flowering period and are dominated by nitrogen fertilizers. Phosphate fertilizers and potash fertilizers can be used in combination. Generally, 37.5-75 kilograms of urea or 150 kilograms of ammonium sulfate can be topdressed per hectare, followed by 75-150 kilograms of potassium chloride or potassium sulfate and 112.5-150 kilograms of superphosphate. The top dressing is generally combined with cultivating and weeding, that is, after weeding, ditch the ridges (distances of 5-10 cm from the plants) and the depth of the ditch is 5-10 cm. The fertilizer is evenly applied to the ditch, and the soil is immediately applied to cover the soil. Prevent loss of nitrogen volatilization. Sildenafil is a selective inhibitor of cyclic guanosine monophosphate (CGMP) - specific phosphodiesterase 5 (PDE5) and an oral drug for the treatment of ED. The physiological mechanism of normal penile erection involves the release of nitric oxide (no) during sexual stimulation. Nitric oxide activates guanylate cyclase in the smooth muscle cells of the corpus cavernosum, which leads to the increase of cGMP level, resulting in the relaxation of the smooth muscle in the corpus cavernosum, the expansion of the cavernous sinus and the inflow of blood. Erectile dysfunction is mainly due to the dysfunction of smooth muscle relaxation of corpus cavernosum. Sildenafil has no direct relaxation effect on human sponges in vitro, but can enhance the effect of nitric oxide by inhibiting the decomposition of cGMP by PDE5 in sponges. Sildenafil can inhibit PDE5, increase cGMP level, relax smooth muscle of corpus cavernosum and let blood flow into corpus cavernosum. Studies have shown that erectile response increases with the increase of dose and plasma concentration, and the efficacy can last for 4 hours (but is weaker than that at 2 hours). Sarms Capsules,Sildenafil Capsules,Healthcare Capsules,Herbal Capsules Xi'an Tian Guangyuan Biotech Co., Ltd. , https://www.tgybiotech.com