LanguageLanguageIn the early stage of vegetable planting development, my parents' generation planted vegetables with traditional methods -- applying farm manure and bean cake, and applying a small amount of compound fertilizer and urea, so that vegetables grew well with a long harvest period and high yield. No rotten roots, dead trees, heavy stubble, yellow leaves, yellow head, viral diseases. The stems and leaves also contain few pests, no pesticides at all, and produce truly organic vegetables.
After 2000, the vegetable industry began to take shape, with chemical fertilizer factories and agricultural pharmaceutical factories flocking to the country and agricultural stores all over the countryside. In order to make money, some agricultural technical experts became the spokesmen of fertilizer and pharmaceutical factories. Newspapers and TV stations that originally spread technology were contracted to promote fertilizer in different ways. Under the influence of experts' lectures and media reports, farmers' correct planting and fertilization habits were changed. The pursuit of plant growth and strong green leaves, large amount of fertilization, neglect of root development, lack of nutrition supply in the middle and later stages, resulting in land deterioration, reduced planting yield, more diseases and increased input.
Plants absorb all kinds of nutrient elements according to the proportion of growth demand. Farmers now apply a large amount of high-nitrogen organic base fertilizer and chemical fertilizer in the early stage to inhibit the absorption of potassium, phosphorus, calcium, magnesium, sulfur, iron, zinc and other elements, resulting in weak roots and few roots. The stem and leaf are competing for nutrition, flower bud differentiation is difficult, flowering is little, fruit setting is difficult, fruit is small; Thick stems, delayed lignification, large and thin leaves, and at the same time change the proportion of carbon and nitrogen in soil and plant, which is conducive to the propagation of diseases and pests, resulting in more diseases and pests, dead trees, rotten stalks, and bad leaves.
In the middle stage, the application of the so-called NPK balanced fertilizer (20-20-20,15-15-15) was actually 2-3 times higher than the standard phosphorus fertilizer. Late application of so - called sulfur - based high potassium expanded fruit fertilizer, potassium excessive inhibition of nitrogen absorption, cause stem fruit lignification, yellow head, fruit small, stiff fruit, reduce production, premature senility, such as tomato green shoulder fruit, soy sauce fruit. Excessive nitrogen, phosphoric acid and sulfur fertilizer is the main cause of root rot.
