Summary
High-temperature light in the summer and autumn became a major constraint on the smooth production of cabbage, with high-temperature tans contributing to problems such as poor seedlings, atrophy of young children, foliage burns, heart failure and frequent disease. As a lightweight and efficient facility agricultural material, sunnets can regulate light in sheds, reduce ambient temperatures, buffer storm surges, and create an environment suitable for growing and growing cabbage over the long term. Analysis of the role of the sunshad network in cabbage cultivation, specification selection, scientific coverage management and application care provides technical reference for the cabbage production。
I. Central role of the sunshad network for cabbage
First, to cool the shade and to ease the high temperature coercion. Temperatures often exceed 35°c in the summer and fall sheds, and sharp direct light burns cabbage and inhibits normal metabolism. Rationally covered sunnets can filter some of the strong light, reduce surface temperature in the sheds by 5°8°c, reduce the evaporation of leaves, avoid tanning of seedlings and ensure normal growth of cabbage seedlings。
Secondly, it protects seedlings against extreme weather. Sun-shields can reduce the impact of heavy raindrops, prevent rain-pushing into seedbeds, damage to seedlings and reduce soil sheeting. It also reduces soil moisture evaporation, preserves soil moisture stability, reduces the frequency of water irrigation, ensures that seedlings are properly collected after sowing and increases the rate of nursery activity。
Thirdly, reduce the incidence of disease. Cabbage is more likely to induce viral diseases in high-temperature light environments. Moderate cooling of the sunnet, improvement of the small field environment, weakening of the conditions for disease outbreaks associated with high temperatures, reduction of the probability of disease in the field, reduction of pesticide use and improvement of the quality of cabbage products。
Ii. Specific specific specific for the birth bullet guard
Cabbage, which is of a neutral nature, is resistant to excessive long-term shades of light, which result in long, long leaves, loose hearts and lower yields。
During the nursery stage of the large cabbage, preference was given to a black shade net with a 50-60% luminous luminous rate, with a 4-6-spectrum specification, which balanced the cooling and light co-operation needs of the shade. After planting, the duration of the lichen season and the end of the ball can be reduced appropriately by using 40-50% net content. In addition to cooling, silver gray sunnets have a certain effect of aphid avoidance and are suitable for high-prevalence plots. Avoiding over 70% photo masking to prevent a lack of light from affecting cabbage。
Iii. Science-cover management techniques for sunnets
The sunnet is not an end in itself; it is based on the principles of "black skyslides, shades; noon covers, mornings and evenings". The sunscreen is covered from 10 a. M. To 4 p. M. During the high-temperature weather period and is lifted in time in the morning and in the rainy days to ensure sufficient light。
The nursery period is covered by roof cover, with net and cabbage beds remaining 20 to 30 centimetres of ventilated space, not attached directly to the plant, ensuring air flow and avoiding suffocation under the net. The cabbage enters the later stages of the ball, reducing or removing shade cover three to five days before the market, increasing the accumulation of light, increasing the taste and intensity of the cabbage and improving the value of the commodity。
Heavy rain weather can temporarily cushion the rain with a sun-covered net, which can be followed by timely ventilation and humidity。
Application errors and concerns
The most common faults in production are round-the-clock coverage of sunnets, long-term ill-light environments, weak cabbage, poor hearts and low yields. Some of the farmers blindly opt for a high-photernity network, which seeks to cool, neglects the basic needs of cabbage for light and results in reduced production。
Sunnets are only auxiliary regulatory tools and are not a substitute for hydro-fertilizer management. The change in soil moisture following the cover of the sun-covered nets is flat, and there is still a need to water and fatten up and conduct field pest surveys. It is also necessary to select anti-aging materials for sunnets, to extend the life of outdoor use and to reduce the cost of planting。
Concluding remarks
In the summer and autumn growing model of large cabbage, the sunnet is a very expensive facility. The rational choice of the shade specification, with the control of the length of the cover, can effectively address the planting risks associated with high-temperature and high-light light, ensure the availability of sufficient seedlings, promote normal cabbage and achieve a steady production of the acupuncture. It is only by combining cabbage with different stages of growth that the sunnets can be managed flexibly and for short duration that the application value of the sunnets can be fully realized and the cabbage can grow efficiently。
