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Cold Water White Cultivation Technology
1. Pregnancy temperature requirements When the pupa strain reaches a certain amount of growth and accumulated temperature, the booting will begin. If the ambient temperature is between 15-25°C, the pupa strain will be easily parasitized by the turfgrass and will begin to conceive. Therefore, it is necessary to make the pupa strain pregnant and cause the pods (growing point) to be in the temperature range of 15-25°C for a long time. 2, the reservoir selection 1 reservoir outlet temperature increase in water speed according to our planting experience requirements: a. Every year from July to August, there is sufficient uninterrupted cold water for the irrigation and field irrigation. b. The temperature of cold water for string irrigation is not higher than 23°C after string irrigation. Before the indica-japonica inflated, more than 23 °C is unfavorable for pregnancies, 23-25 ​​°C in the expansion of tadpoles, can promote continued expansion. The above two conditions must be available at the same time. If the water temperature of the reservoir exceeds 25°C at the end of July and early August, it cannot be used for production, so it is not suitable for planting cold water. 2 The best storage capacity is 20 million cubic meters. The bigger the better. After the storage capacity is large, the quantity of water and time for water discharge can be guaranteed when the cold water is sprayed in Putian. 3 dam height is best 40 meters or more, the higher the better. The higher the dam, the deeper the water level in the reservoir, and the larger the storage capacity, so that the water temperature accumulated in the bottom of the reservoir is less affected by the temperature and climate, the minimum temperature is easily below 15°C, and at the same time, the amount of cold water is abundant, so that the water temperature for string irrigation Requirements are easy to reach and it is easy to grow in such places. 3, Putian should choose to choose the upper reaches of the reservoir mouth, so that on the one hand, there is sufficient water supply guarantees, on the other hand out of the cold water loss. Should be selected in the valley of the valley or high valleys on both sides of the valley, which is conducive to the accumulation of cold and to prevent loss. In order to ensure that the string of irrigation water between Putian has a certain flow rate, in order to ensure that the string of irrigation water can move in the whole hilly field, so that the water temperature of the entire Qiutao field is uniform, there should be a certain gradient gradient between the fields. Putian should be closer to the channel, drainage channels should be short and smooth, and should not affect the effect of cold water pregnancy is appropriate. If the flow time is too long, it will increase the contact time with the air and accelerate the temperature of the cold water. With the cold water irrigated through the paddy field, the water temperature will gradually increase. After exceeding 25°C, such water will be useless for pregnant plague. In practice, it will form a boundary between scarring and non-scarring, and actual production. Among them, the strains that do not bear clams can only be found after the temperature falls in September-October, and the condition is known as the "marginal effect." This effect must be determined through years of exploration. In the development of a new place, this factor must also be taken into consideration. It is not appropriate to blindly grow large areas. 4, irrigation water management 1 string irrigation water can not lack water during the period of growth, plants from the bud to the level of pregnancy should gradually deepen. Usually from 5 cm to 25 cm, in order to promote effective delivery and sub-plant pregnancy, and make the meat tender and white, while reducing the incidence of ineffective delivery. The deepest water level should not submerge the "eyes", otherwise it will cause the internodes of the stem base to grow long and shorten the fat and reduce the yield and quality. 2 Before the cold water management seedlings are transplanted, the seedlings are to be promoted as much as possible. Therefore, before the transplanting, until the cold water is poured, the field water in Putian is filled faster and prevented from leaking, so as to increase the water temperature in the middle of the paddy field and promote livelihood. Tree. 3 Irrigation cold water time Generally, cold water is released after 1 month. Since the end of July to August is the off-season supply season, it is advisable to start cold water irrigation from the end of June to the beginning of July. The overall growth of the barnyardgrass is early, and the growth is strong. The closure line can be earlier as early as possible, or it can be later. If the cold water is poured prematurely, the pods will not grow in the booting, but will only increase the festival. If it is too late, it will increase the pregnancies and reduce the yield. 4 After the irrigation of cold water, the main management should be even, uniform, full, and diligent. Even the demand for continuous day and night. Uniform, that requires uniform flow of cold water throughout the field, so that the same temperature in the field, pregnant and neat, in order to achieve this, it is best to take the "multi-point water, more water" string irrigation. Full, that is, the field of cold water to maintain a large flow at the same time, the field water level to reach 10-20 cm, when the flow rate of 20-25 cm. In short. During serial cold water irrigation, the outlet water temperature should be below 23°C. If the water temperature is lower than 15°C, the water intake can be reduced and the water level can be reduced. Diligence, that is, it is required to check the time during cold water, and timely find and solve problems. If the water source is continuously protected or there is no guarantee for a short period of 1 day, it is necessary to design the irrigation method as much as possible to ensure that the temperature of the clams in Putian is below 25°C, preferably below 23°C, and the water retention level is 25 cm. Above, as much as possible to reduce the water loss on the adverse effects of pregnancies.