Strawberry Summer Management

    Irrigation and drought prevention make strawberry seedlings grow normally, and the summer is safe. It is necessary to regularly pour water to keep the soil in the seedlings moist. Irrigation requires water to be poured to 2/3 of the gully. The surface of the mulch cannot be submerged. The seedlings are all wet and drained in time. The seedlings cannot be soaked in water for a long time. The time of pouring (irrigating) water is appropriate in the evening. In the case of continuous fine weather, depending on the actual conditions of the plot, it is generally required to be watered once every 3 to 5 days.

    Shading and cooling To avoid high temperature burns on the seedlings and stolons caused by direct sunlight, causing outbreaks of leaf spot and anthracnose diseases, it is best to put a shade of about 1 meter on the surface of the coffin, and cover some firewood and other things on the top; Some high-stalk crops can also be planted in the kneads.

    During the directional pressing and seedling emergence, the stolons should be oriented in a timely manner and evenly arranged. The new plant was slightly pressed with soil to promote new roots.

    Do not loosen the strawberry roots when removing weeds to avoid seedling death. At the same time of weeding, we should remove the yellow leaves and dead leaves of strawberries, reduce nutrient consumption and evaporation of water, and promote ventilation and light transmission.

    The application of thin Fertilizer to the seedlings with insufficient seedlings can be carried out with 2% human excrement or 0.3% compound fertilizer, once every 7 to 10 days, and can be used continuously. The fertilization time should be mastered in the evening to prevent fertilizer damage. .

  During the summer and autumn period of prevention and control of pests and diseases, the most threatening pests to strawberries are cockroaches, which often bite the plants and cause the whole plant to die. The nursery can be watered with 800 times trichlorfon or 1000 times dichlorvos, or manually. Adults of cockroaches often lay eggs on unfertilized piles, and the use of fully decomposed organic fertilizers can reduce the damage.

    (Chen Maochun, Shiyan Agricultural School, Danjiangkou City, Hubei Province)

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Guanidine Nitrate For Making Explosive Materials

Guanidine nitrate is mainly used for the synthesis of sulfadiazine and other Pharmaceutical Intermediates. It is used for the mixture of explosives, explosives and rocket propellants. It is also used for the preparation of guanidine carbonate and other guanidine salts, as well as for the paint industry, photographic materials and disinfectants.

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