Wheat mid-late field management technology

Experts analyze that we must strive for a good harvest this year and there are still some uncertainties. The first is the cold spring. Before the end of April, it was the high incidence of late frost damage. At this point the wheat has been jointed. Once a cold wave strikes, the young wheat ears are susceptible to freezing and the yield will be lost. The second is rainfall. If there is ample rainfall in the middle and late April in the northern wheat area, it will effectively increase the number of grains per spike and 1000-grain weight and achieve high yields. This is an important factor affecting the yield in the middle and later periods. The third is pests and diseases. At present, wheat stripe rust, red spider mites, and midge pests are early-onset and re-emerging conditions. The risk of replanting and overlapping of various diseases and insect pests such as head blight, powdery mildew, and roundworm during mid- and late-year periods still exists. If it cannot be effectively controlled, There is a greater threat to wheat production. The fourth is dry hot wind. The occurrence of dry hot wind in late wheat is unpredictable. If it is re-issued, it will inevitably cause dry wheat, high temperature ripening and 1000-grain weight drop, which will have a greater impact on the yield. The fifth is lodging. Affected by the previous drought, the number of secondary roots of wheat was less, and the depth of the lower bar was shallow. When drought-resistant wheat is poured, quick-impact chemical fertilizers are generally applied throughout the country. The temperature of the jointing period of wheat is relatively high, and the internodes grow fast. If there is weather and rain in the later period, there is a greater risk of lodging. Six is ​​bad rain. In case of bad weather, the germination rate of wheat seeds will be reduced, and the yield and quality will be reduced.

At present, it takes about 50 days to harvest large areas of wheat, which is an important period for wheat production. All localities should properly manage the field management of wheat in the middle and later stages because of the conditions of the heavens, the land, and the seedlings. The first is to manage the jointing period. In the northern wheat region, the wheat field with smaller population and weak seedlings should be properly watered and fertilized early to increase the percentage of tillers and spikes. The wheat field with large population and high soil fertility can be postponed to topdressing. The second is to prevent the cold. Watering before the onset of cold spells in early spring can increase water vapor in the near-surface air and release latent heat when condensation occurs. At the same time, soil moisture increases after irrigation, and the thermal conductivity of the soil increases. Immediately after freezing wheat in the early spring, immediate nitrogen fertilizer and watering should be applied to promote early tillering of wheat, increase tiller percentage, and reduce loss of freezing damage. The third is pouring a good grout. In the northern wheat region, water is poured from flowering to grain filling according to the wheat field in wheat field, which can meet the growing demand of wheat in the later period. However, excessive soil moisture before maturity will affect root activity, and watering should be stopped 10 days before the maturity of wheat. The fourth is to prevent and control pests and diseases. Focus on the control of sheath blight, stripe rust, head blight, midge and maggots, strengthen forecasting, check the condition, insects, accurate forecast, timely prevention and treatment. The fifth is to do a good job "one spray and three defenses." For the wheat field with yellow growth and deferment fertilizer, the topdressing concentration of 1-2% urea solution can be combined with pouring heading and flowering water. The wheat field with normal growth can be sprayed with potassium dihydrogen phosphate solution with concentration of 0.3% in combination with pest control to help promote the operation of carbohydrates and increase grain weight.

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