Spinach can be cultivated in all seasons, but it is still based on autumn sowing, generally speaking, it is in August to September, it can also be advanced to July, or delayed to early October sowing, which can be harvested in 30 to 40 days after sowing, and early autumn spinach should be selected for early maturing varieties that are more heat-resistant and grow faster. Summer spinach is sown in stages from May to July, and harvested successively from late June to mid-September, at which time it is necessary to choose varieties with strong heat tolerance, rapid growth and not easy to pump. After the emergence of spinach planted in May and July, it is necessary to cover the shade net, and the method taken is to cover it on sunny days, uncover it on a cloudy day, and uncover it late, so that it can be cooled down and moisturized, and delay the time of pumping.
Spinach sown in July, belongs to the summer spinach, its whole long stage is in the high temperature period, when the vegetative growth of spinach has been inhibited, it is very easy to pump, in order not to appear this phenomenon, it is necessary to have sufficient fertilizer water supply, pay attention to the re-application of base fertilizer, the former stubble crop after harvesting to clean the countryside in time, immediately start fertilizing and land preparation, it is recommended to spread rotten compost 3000 ~ 4000 kg per acre, there are 30 ~ 35 kg of calcium superphosphate, ammonium sulfate is 20 ~ 25 kg, The amount of potassium sulfate is 10 to 15 kg as a base fertilizer.
Sown spinach seeds need to be treated at low temperatures, and the soil is disinfected before sowing to prevent eggs underground. Spinach after sowing to have shading measures, to take the whole process of rain shelter cultivation, after the emergence of seedlings can use the greenhouse or small arch to cover the shade net, sunny cover yin unveiling, late cover early unveiling, cooling and moisturizing, to prevent the washout of heavy rain.
Water frequently, water less, and is watering cool water, once in the morning and once in the evening, with the growth of spinach seedlings to reduce the number of watering, to keep the soil moist, do not use large water for flood irrigation, while timely drainage after rain and flood prevention. The water demand of spinach during the vigorous growth period is relatively large, and it is necessary to water according to the moisture of the soil.
Topdressing should master light application, diligent application, fertilization when the soil is dry, pay attention to the first light application and then thick application. Out of the true leaves to timely pour 1 time light manure in the first 15 days of harvest to stop the application of manure, in the peak period of spinach growth, need to be phased combined with watering to apply fast-acting manure is 2 to 3 times, it is recommended to apply urea or ammonium sulfate 10 to 15 kg per acre, you can also choose to spray foliar fertilizer (0.3% urea), after each fertilization to continuously water water for 5 days of water.