First, change color. White asparagus is used as a raw material for canning, and it is softened and aged by paddy soil before harvesting. Asparagus harvested from ordinary soils requires that the bamboo shoots be white or milky yellow, and if it is green or green-red, it is discolored. The reason for the discoloration is that the soil is too viscous or overly sandy. The former is easily cracked, and the latter has large pores, which cause the gaps to transmit light and make the asparagus see light discoloration. Second, the soil temperature is high and dry. In order to prevent discoloration of asparagus, cultivation should pay attention to the use of sandy loam soil, intensive cultivation, so that the uniform thickness of the soil particles, water moderate, uniform soil elastic. If the ground temperature is too high, it should be properly watered to increase soil moisture and reduce cracking. If covered with black membrane instead of soil for softening cultivation, the effect is better. Second, deformity. During harvesting, the asparagus's tender stems are curved, with uneven thickness, and with no round or flat cross sections. The main reasons for this are the application of organic manure without overuse or over-application of one fertilizer, the burning of the growth point of the tender stem, or the inhibition of the normal development of the growing point; the second is the large viscosity of the soil, the large amount of clods, and the uneven elasticity of the soil. The normal growth of the tender stems; once again the damage to pests when the stems are pumped. Prevention measures: Fine arable land, keep the soil loose, and pay attention to the control of underground pests. Third, hollow. The middle stem of the tender stem is a hollow bamboo shoot. Due to the imbalance of nutrition, the lack of phosphorus and potassium fertilizers, excessive nitrogen topdressing during the shoot-up period, and leggy growth of plants. Control methods: Adopt appropriate fertilization for shoots, pay particular attention to topdressing phosphorus and potash fertilizers, and do not apply nitrogen fertilizer alone to ensure that the ground part grows stout. Fourth, the tender stem cracking. During the shoot-up period, the tender stems are cracked brown and deep and cause decay. The reason is that the soil is deficient in phosphorus and potassium, and the plants are long; followed by a long drought in the event of flooding, causing the stems to expand too quickly and cause cracking. Prevention and control measures: Phosphorus and potassium fertilizers should be added, watering should be even, and dry and damp should be avoided. Fifth, odor. Asparagus is fragile, bitter, or has Other odors that can affect the value of the product. The reason for this is caused by the pollution of pesticides and watering of municipal wastewater, or by toxic waste gas and industrial waste. For this reason, do not use inorganic fertilizers when growing earth; before and after earthing or harvesting, shoots of pesticides, garbage, and industrial wastewater should be strictly prohibited.
Black Tea,Organic Black Tea,Herb Tea
Prettyfly Technology Co., Ltd. , http://www.prettyflytea.com