The soil in the south is heavy and the groundwater level is high. When it is rainy and autumn in autumn and winter, a lot of rotten and dead seedlings often occur after transplanting rapeseed. The rotten roots of rapeseed have a great impact on the yield. In addition to improper selection of land, soil weight, high groundwater level, rice fields are too late to drain, wet tillage, mud transplanting, extensive land preparation, "three ditch" nowhere, rainy weather or flood irrigation Etc., the soil water content is too high, the field is stagnant, the soil is poor in air, carbon dioxide is increased, the oxygen content is insufficient, and the reducing substances are produced to poison the roots.
In order to effectively reduce the loss of dead roots of rapeseed in paddy fields in low-humid areas, it is recommended to carry out the following "four reforms" measures to prevent moisture and seedlings.
1. Change the wet ploughing to dry tillage. That is, for the paddy field of transplanted rapeseed, grasp the 7-8 days before the harvest of the late rice, dredge the ditch system, drain and dry, and strive to do the ploughing and tidying the land without drying, wet and not paste, changing the past plough drainage , wet ploughing, and rapeseed planting mud.
2. Reconcile the box and the shallow groove into a narrow box and a deep groove. The test proves that adhering to narrow compartments and deep trenches is an important measure to improve the conditions of cool water in the field. Generally, the 1.7-2 m compartment is used, and the compartment is 0.7 cm lower than the tillage layer. In this way, the water level of the soil layer is lowered, and the water content is lowered, thereby fundamentally eliminating the harm of water to the vegetable seedlings.
3, change the acupuncture points to plant the seedlings, the fat soil roots. Transplanting rapeseed in rainy weather is likely to cause water accumulation in the seedlings, which is unfavorable for survival. The experiment proves that the conventional acupoint colonization method is changed to open a small ditch pendulum seedling, and the roots of the fine-grained soil are used to avoid the root system that is caused by the acupoint colonization, the water in the root of the vegetable seedling, and the lack of oxygen. The rate of Lai Miao is 15-40% higher than that of acupuncture.
4, change the flood irrigation for pouring. When rapeseed is planted in dry weather, it is unfavorable for the seedlings to survive. However, the anti-early method is unreasonable and is also prone to wet damage. In recent years, through the comparison of three anti-early methods of watering, pouring, pouring, and flooding, the results showed that the live rate of watering was higher than that of furrow irrigation and flood irrigation. 22.6% and 45.6%. Practice has proved that it is easy to destroy the soil structure when the drought-ridden rapeseed is suddenly irrigated, which causes the soil surface to be knotted and forms “dark stainsâ€, which causes the roots of the vegetable seedlings to be stagnant, and water damage and roots occur. Splashing can avoid soil soaking. Sprinkler irrigation is conditional, of course better.
Non-Locking Mast ,Antenna Push Up Pole,40 Ft Telescoping Pole,Portable Telescopic Mast
TIANHEMAST , https://www.robomasts.com