Study On Calcium Cyanamide's Control Effection On Soil Disease And Vegetable's Growth

Because of our dependency vegetables backward in technique management, soil tiny ecological environment worsen, cause the sound soil function to be damaged , fertility drops, pathogens breed , soil spread disease to be serious, make obstacle aggravate, influence vegetables output and quality seriously. Calcium cyanamide is paid attention to standing up as the key soil disinfecting environmental protection disinfectant again in recent years.Calcium cyanamide,the principal ingredients is the nitrogen calcium cyanogen (molecular formula:CaCN₂,English name:Calcium Cyanamide),other compositionsxalcium oxide and carbon,etc.Calcium cyanamide granule is black,no dusty,strong alkaline fertilizer and can regulate the soil acidity,improve the utilization ratio of nitrogen,meliorate the soil, prevent and cure the soil-spread disease,etc.Calcium cyanamide react with moisture among soil and produce calcium dihydroxide and hydrogen cyanamide which can hydrolyze and form urea , is finally decomposed into ammonia to be absorbed directly by plants. In the alkaline soil, the hydrogen cyanamide can aggregate to dicyandiamide.Transform from hydrogen cyanamide to ammonium may take long time.The hydrogen cyanamide liquid can restrain and kill Fusarium solani f.sp.cucurbitae apores.calcium dihydroxide may rise the pH of water which increased its conrtroling rate. The complete resolving in water of calcium cyanamide takes 4-5 days.Botrytis cinerea Pers and Sclerotinia sclerotiorum (Lib) de Bary are completely controlled at the concentration of 1000μg/ml and Fusarium solani f.sp.cucurbitae is completely controlled at the consentration of 1500μg/ml.In area and time with abundance sunlight, higher temperature, straw etc can be mixed in soil of greenhouse and pour water among bed,spread a layer of plastics transparent membrane on the ground finally.soil temperature risese notably,the moisture which in the soil hole is kept warm...