Prevention and cure techniques of rape rot in the rainy days
The soil in the south is heavy and the groundwater level is high. In the autumn and winter and rainy years, a large number of rotten seedlings often appear after transplanting rape. Rotten rape root dead seedlings have a great impact on yield. In addition to improper land selection, soil viscous weight, and high groundwater level, there are late paddy drainage, wet cultivation, and mud transplanting. Such as, resulting in high soil moisture content, field water retention, lack of air in the soil, increased carbon dioxide, oxygen content is insufficient, and produce reducing substances to make root poisoning rotten.
In order to effectively reduce the loss of rotten-root rapeseed rot in paddy fields in low-humidity areas, it is recommended that the following “four changes†measures be taken to prevent moisture and protect seedlings.
1. Change the wet cultivation and plough to dry cultivation. That is to say, the rice fields transplanted with rapeseed should be caught in the 7-8 days before the late rice is harvested to clear the ditch, drained, and drained. It is necessary to achieve a dry but not stiff, wet, and not paste when plowing and soil preparation. Wet cultivation, rapeseed practices.
2, change the wide car, shallow ditch for the narrow car, deep ditch. Tests have proved that adhering to narrow compartments and deep trenches are important measures to improve the conditions of the cool water in the field. Generally take a 1.7-2m compartment, the compartment trench is 0.7cm lower than the tillage layer. In this way, the water level of the soil will be lowered, the site of the water will be reduced, and the harm of water to the vegetable seedlings will be fundamentally eliminated.
3, change the hole to plant colonization for the pendulum seedlings, fertilizer and root pressure. Transplanting oilseed rape in rainy weather can easily cause seedlings to accumulate water, which is unfavorable for survival. The experiment proved that the conventional method of planting holes was changed to open small ditch pendulums, and the use of finely-divided fertile soil to avoid rooting in the roots caused by planting holes, and water and oxygen deficiency in the roots of the seedlings. The rate of seedlings increased by 15-40%.
4, change the flood poured into the pouring. Dry rapeseed cultivation, unfavorable to survival of the seedlings, must be taken to prevent seedlings from taking early measures. However, anti-early methods are irrational, and they are also prone to wet damage. In recent years, through comparison of the three anti-early methods of watering, pouring, pouring, and flooding, the results showed that the rate of live seedlings was higher with watering, and the live seedling rate was higher than that of furrow irrigation and flood irrigation. 22.6% and 45.6%. Practice has proved that sudden soaking of irrigated rapeseed land, it is easy to damage the soil structure, resulting in surface compaction, and the formation of "dark stains", resulting in the roots of vegetables standing water, and water damage roots. Pouring to avoid soil soaking. Sprinkler irrigation can be used conditionally, of course better.
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