Most of the northern regions are solar greenhouses. Central and southwestern regions are mostly small and medium arch sheds. There is excessive fertilization in production. Nitrogen, phosphorus, and potassium fertilizers are used at high rates, and the nutrient input ratio is unreasonable. Soil nutrient accumulation of nitrogen, phosphorus and potassium is significant. Irrigation results in serious loss of nutrients, widespread soil acidification, impeded supply of soil elements such as calcium, magnesium, and boron, and continuous cropping obstacles that result in serious degradation of soil quality, reduced nutrient absorption efficiency, and decreased quality of vegetables. The following fertilization principles are proposed: ) Reasonably apply organic manure, adjust the amount of nitrogen, phosphorus, and potassium fertilizers; non-calcareous soils and acidic soils need to be supplemented with trace elements such as calcium, magnesium, and boron; (2) rationally distribute chemical fertilizers according to crop yields, cornices, and soil fertility conditions, Most phosphorus fertilizers are based on nitrogen and potassium fertilizers; in the early spring, they are not suitable for top-dressing in the early growth period, and they pay attention to post-harvest and middle-late-stage top-dressing; (3) Combine with high-yielding cultivation techniques to promote seedling rooting, adopting the principle of “few timesâ€. Reasonable irrigation and fertilization; (4) Old sheds with degraded soil need to be returned to the field or apply organic fertilizer with high C/N ratio. Less application of poultry manure, increase the number of rotations, to achieve the purpose of removing salt and reduce continuous cropping obstacles; (5) The acidification of vegetable fields should be moderately applied lime and other acidic soil conditioners.
Fertilizer amount and method
(1) Seedling fertilizer: increase organic fertilizer, supplement phosphate fertilizer. Each 10 m2 seedbed was subjected to decomposed poultry manure 60-100 kg, calcium, magnesium, phosphate 0.5-1 kg, potassium sulfate 0.5 kg, according to the seedlings sprayed 0.05%-0.1% urea solution 1-2 times. (2) Basal fertilizer: Apply high-quality organic fertilizer 2-3 quarts/mu. (3) The output level is 8000-10000 kg/mu: nitrogen fertilizer (N) 30-40 kg/mu, phosphate fertilizer (P2O5) 15-20 kg/mu, potassium fertilizer (K2O) 40-50 kg/mu. (4) Production level 6000-8000 kg/mu: nitrogen fertilizer (N) 20-30 kg/mu, phosphate fertilizer (P2O5) 10-15 kg/mu, potash fertilizer (K2O) 30-35 kg/mu. (5) Production level 4000-6000 kg/mu: nitrogen fertilizer (N) 15-20 kg/mu, phosphate fertilizer (P2O5) 8-10 kg/mu, potassium fertilizer (K2O) 20-25 kg/mu.
Vegetable soil pH
A medium-sized cob of corn provides more than 10% of our daily dietary fibre requirements.
There are two types of dietary fibre - soluble and insoluble - and sweet corn contains both.
According to the American Heart Association, dietary fibre as part of an overall healthy diet can help lower blood cholesterol levels and may reduce the risk of heart disease. It is insoluble fibre that binds to cholesterol, preventing it from being absorbed into the bloodstream.
Insoluble fibre is responsible for promoting regularity and helping to prevent constipation by speeding up the passage of food and waste through the intestines and absorbing water to keep stools soft. Insoluble fibre has been shown to reduce the risk of haemorrhoids.
Fibre-containing foods such as sweetcorn also help to provide a sense of satiety and may therefore help to suppress appetite and aid weight management.
Dietary fibre has also been linked to a reduced risk of type 2 diabetes. A diet rich in fibre helps patients manage their disease.
Fibre is fermented by bacteria in the colon. Promising studies are underway to determine the health-promoting effects of fibre fermentation breakdown products, for example, short-chain fatty acids, which may help to maintain a healthy gut.
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