I. What are the differences between the water level standards for deep and shallow waterfalls and how are they regulated in production
Adaptation to water levels can be divided into two ecological types, shallow and deep. The shallow water is suitable for a water level of 10-20 cm with a maximum water tolerance of 30-50 cm. Deep water is suitable for a water level of 30-50 cm with a maximum water tolerance depth of 1-1. 2 m。
The general principles of shallow water management are shallow, mid-deep and shallow. After planting, the buds are born long after the leaf has been planted, and the shallow water should be kept to increase the temperature of the earth and to promote the growth of the buds. It is generally preferable to maintain a deep water layer of 4-7 centimetres, which, with the emergence of the vertical leaves, gradually thrives and rises to 12-15 centimetres. When the leaves are terminated, it is indicated that the condensation begins and the water layer is gradually reduced to 4-7 cm to promote the condensation. Deep-water water levels are not easily regulated, mainly to prevent flooding during periods, especially when the leaves are inundated, and should be drained urgently within eight hours to expose the leaves to prevent drowning。
Ii. How can weeds in ponds be removed rationally using herbicides
In the process of the growth of the lichen, especially before the growth of the shallow water, the weeds of the eye in the water field, the fur of the cow, the short mushrooms, the triscabs, the pelicans and the black algae are more numerous and grow faster, affecting the growth of the lichen, and shall be weededed in time. Previously, weeding was often done manually, with a heavy workload, and it was easy to step on the root of the bed. If weeding is used chemically, it saves labour and effort and does not harm the lichen。
In recent years, research and experiments by technologists have led to the identification of safe and effective methods of chemical weeding in the field and are being promoted in production。
(1) 50% of the veroglycerous cream is selected, 100 ml is taken when the lichen leaves are 30 cm above the water surface, 5 kg of urea first mixed with 5 kg of fine soil, and when the dew is dry, the field remains 7-10 cm deep and is administered for more than a week, with a good effect, with an effect of more than one month。
(2) the selection of 12. 5 per cent of grass energy or 35 per cent to kill 40 ml with water of 40-50 kg, which, after full mixing, sprays the weeds when the dew is dry, after four days, has had a significant effect on the killing of herbivage in the 3-4 period。
Iii. How can a rational pursuit of fat ensure the normal growth of lichen
The nutrients required for the growth and development of the lichen, on the one hand, come from the light co-operation of the loaf and, on the other hand, from the soil, where the old fertilizers (including base fats) are limited, will grow less and less as the plant grows, although fish excreta and bait can provide a certain amount of nutrients, but they are scarce compared to the demand for the lewd growth and must be followed up in a timely manner。
Liang has a long reproductive period and is usually followed by two to three fats. The first took place at the beginning of the leaf, when 667 m2 of manure was applied to 750-1,000 kg of manure after weeding. The second fertilization was carried out at a time when 5-6 tablets were in place, with about 1,000 kg of human urine per 667 square metres. The third fertilisation occurs when leaves are terminated and the knot begins, called fertilizer. 1,500 kg of manure per 667 m2 and 30-50 kg of cake。
Fertilizers should choose clear weather and avoid taking place at noon in the sun. The field is released before fertilization so that the fertilizer is inhaled into the water and then watered to its original depth. In deep-water fields, where fertilizers are prone to loss and cannot be applied directly to liquid fertilizers, the method of applying them should be solid. It's re-enactment, and it's buried in the mud. In pursuit of fertilizer, fertilizer is first fully blended with river mud, which is then used in the field。
