Crops How to Prevent Downwind Cold

The “cold spring” is the weather phenomenon in early spring when the temperature is lower than normal in the same period. Crops often suffer from freezing damage. Here are some measures for how winter wheat, vegetables, and fruit trees can prevent and cure the cold.

How Does Winter Wheat Prevent Cold Spring

In the spring and winter wheat fields of Hubei and Anhui in the middle and lower reaches of the Yangtze River, sowing early, there is a long wheat growth, and it is easy to freeze some young ears in late spring; the sowing dates are late in the northern Huanghuaihai and northwestern wheat areas, and in central Shanxi and northern Shandong. Wheat with weak seedlings has poor frost resistance and is prone to frost damage. The frozen wheat leaves resembled boiled water, and the main stem was frozen to death, but the tillering was still alive.

Prevention measures: Pay attention to the weather forecast, water before the cold flow in early spring, stabilize the water and increase the soil temperature, prevent freezing damage; restraining the growth of Wang Miao through appropriate repression and spraying of Zhuang Fengan in early spring can improve the cold resistance of wheat; In case of freezing injury, remedial measures should be taken promptly. In early spring, frozen wheat generally does not die. Small pods or axillary buds can also be divided into panicles. Therefore, it is necessary to combine watering, apply appropriate amount of nitrogen fertilizer as soon as possible, and promote early tillering of wheat. Small locust rushes up and raises panicle growth rate to minimize losses. In the southern part of the rice buckwheat field, we must timely excavate the Sangou (Sedige, Yaogou, Weigou) to ensure smooth drainage and prevent waterlogging; strengthen wheat stripe rust, sheath blight, head blight, and powdery mildew. Prediction and forecast of insect pests such as midge, wheat aphid, and wheat spiders, and chemical control, to minimize losses caused by pests and diseases.

How to Control Downspring in Greenhouse Vegetables

Pay attention to weather forecast, timely and reasonable control. Specific measures: humidity and light transmission. When the weather turns sunny, the shed is moderately uncovered. It is airy and light-transmitting, but the shed cannot be too fierce. Otherwise, the sudden water loss of the plant will cause “flash sprouts”; timely removal of the old leaves of the lower part of the plant will improve the ventilation and light transmission conditions and reduce nutrients. Consumption; In order to reduce the humidity in the greenhouse, drip irrigation, spraying foliar fertilizer and other water-saving measures; supplement nutrition. For vegetables that have not suffered freezing injury or are lightly affected, spray two to three 0.2% potassium dihydrogen phosphate solutions as appropriate. For plants that are yellow in color and lack nitrogen, spray 0.3 to 3% urea solution. Note that due to weak seedlings, the sprayed fertilizer concentration should not be too high; even if nitrogenous fertilizer is applied, soil should be applied afterwards, because ammonia volatilization and burning seedlings are prone to occur under the closed conditions of greenhouses, and pests and diseases are prevented. Low temperature and high humidity can easily lead to the breeding and spread of gray mold, etc., and timely clean up the defoliation of stumps and strengthen the prevention and control of pests and diseases.

How Fruit Trees Prevent Cold Spring

The cold spring has the most obvious damage to apricots, cherries, apples, pears, kiwifruit and other early flowering fruit trees. The following prevention and control measures shall be taken on the basis of reasonable fertilization, irrigation, branch pruning and wintering management: watering. Where an easy-to-cold orchard has irrigation conditions, water should be poured 1 to 2 times before and after germination to reduce the temperature of the soil, delay germination, escape the cold, and spray salt water. Pay attention to the weather forecast and spray 10% to 15% of the salt water on the trees before the cold freezing damage. In doing so, it can resist freezing by increasing the cell fluid concentration of the tree; it can reduce the cold damage of the tree through the condensation of water vapor; smoke fumes. When the cold weather arrives, smoke in the orchard as soon as possible: preferably at night when the temperature drops to 0°C. 6 to 7 dry sticks and weed stacks are stacked per acre, and the soil is pressed after combustion to increase the effect of smoke generation; Before the onset of frost damage, spraying 0.2%-0.3% potassium dihydrogen phosphate aqueous solution on the budding fruit trees can increase the cold resistance of the tree, thereby reducing the freezing injury.

Chlorodiphenylphosphine CAS No.1079-66-9

Chlorodiphenylphosphine Basic Information
Product Name: Chlorodiphenylphosphine
CAS: 1079-66-9
MF: C12H10ClP
MW: 220.63
EINECS: 214-093-2
Mol File: 1079-66-9.mol

Chlorodiphenylphosphine Structure

Sensitive Air & Moisture Sensitive

Chlorodiphenylphosphine Application

Chlorodiphenylphosphine is used to introduce the diphenylphosphinyl moiety by aryl ortho-lithiation. It is also used as an intermediate to make antioxidants, flame retardants, stabilizers, catalysts, photoinitiators, and optical brighteners. Used as a halogenation reagent for the conversion of alcohols into halides, in the preparation of solid-phase reagent for the conversion of alcohols to alkyl halides.

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