Problems in fertilization and principles of fertilization
In view of the problems of less organic fertilizer application, blind application of nitrogen fertilizer, lack of application of phosphorus and potassium fertilizers, and unreasonable fertilization time and methods, the following principles of fertilization are proposed: (1) Increase organic fertilizer, control nitrogen fertilizer, increase application Phosphorus and Potassium Fertilizers; (2) Fertilizer distribution methods are based on base and chase. Topdressing with nitrogen fertilizer, rational use of potash fertilizer; (3) the acidification of a serious vegetable garden, should be appropriate use of lime and other acidic soil conditioner; (4) fertilization and high-quality cultivation techniques, especially water management combined to improve the efficiency of fertilizer and water use.
Fertilizer amount and method
(1) Basal fertilizer: One application of decomposed farmyard fertilizer 1000-1500 kg/mu. (2) Output level above 3500 kg/mu: nitrogen fertilizer (N) 16-18 kg/mu, phosphate fertilizer (P2O5) 7-9 kg/mu, potassium fertilizer (K
2O) 8-10 kg/mu. (3) Output level 2500-3500 kg/mu: nitrogen fertilizer (N) 14-16 kg/mu, phosphate fertilizer (P2O5) 5-6 kg/mu, potassium fertilizer (K2
O) 6-8 kg/mu. (4) Output level 1500-2500 kg/mu: Nitrogen fertilizer (N) 12-14 kg/mu, Phosphorus fertilizer (P2O5) 4-5 kg/mu, Potash fertilizer (K2O) 5-6 kg/mu.
The acidity of lettuce is very poor. When the vegetable garden soil in the southern region has a pH of less than 5, 150-200 kg of quick lime should be applied per acre.
All nitrogen fertilizers were top-dressed, followed by 30% top dressings at 20%, 30% and 50% in the returning green stage, rosette stage and rapid growth stage. Potassium fertilizer was applied at 40% to 50%, and the rest was in the rosette stage and rapid growth stage. For the topdressing in two rounds, all of the phosphate fertilizers were applied as base fertilizer or applied.
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