Harm and control of crop continuous cropping

If the same or the same crop is planted in the same field for several years, it will cause different yields, deterioration of quality, breeding of pests and diseases, and deterioration of fertility status. This phenomenon is called a continuous cropping disorder. Continuous cropping is the most common in vegetable cultivation and the most difficult to control. The reasons are manifold, mainly due to the following four factors:

First, the crop self-toxic effect. Some crops can release some substances through the above-mentioned partial leaching, root secretion and decomposition of crop residues, which inhibit the growth and development of the same or lower sorghum or the same crops. This phenomenon is called autotoxicity.

Second, the soil is beneficial to the reduction of microorganisms and the increase of harmful microorganisms. Due to continuous cropping, a special soil environment has been formed, which inhibits the growth and reproduction of beneficial microorganisms such as nitrogen-fixing bacteria, rhizobium, photosynthetic bacteria, actinomycetes, nitrifying bacteria, ammoniated bacteria, and mycorrhizal fungi, while harmful microorganisms are abundantly cultivated. It will change.

Third, the soil properties deteriorate, secondary salinization and soil acidification are serious. In order to unilaterally pursue high yield, a large amount of chemical fertilizer and unfertilized animal manure, human urine and feces are applied in a large amount, resulting in excessive salt in the soil.

Fourth, the nematode harm. Nematodes are crop parasites that primarily destroy the roots of crops, affecting their normal growth, and are difficult to control.

Prevention and control of crop continuous cropping hazards:

First, fertilization: soil testing formula, balanced fertilization, regulating nutrition, mainly organic fertilizer, organic fertilizer and inorganic fertilizer combined.

Second, management: rotation intercropping, excellent grafting.

Third, cultivation: soil disinfection, drug treatment bacteria supplement.

(smile)