Strawberry needs four stages:
(1) phase i
From the time of conception to natural hibernation (approximately four months). As the temperature decreased in the autumn, the roots grew less and the plants gradually entered hibernation. The intake ratio of nitrogen (n), phosphorus (p2o5) and potassium (k2o) is 1:0. 3 ∶0. 3 at a lower rate than the nutrients absorbed by the root。
(2) phase ii
(c) the period of rest from hibernation to the present period (approximately 2 months). As the temperature rises in the spring, the roots of the upper and lower parts of the ground begin to grow more robustly, with a marked increase in nutrient absorption, especially of phosphorus and potassium, at which point the absorption ratio of nitrogen, phosphorus and potassium is 1:0. 3:0. 6。
(3) phase iii
The upper part of the ground enters booming growth, the first stage of the flowering sequence begins to mature, the second and third stages of the flowering and fruit expansion begin with a peak in nutrient absorption, with nitrogen absorbing more than 85 per cent of the total fertility period, phosphorus absorbing about 66 per cent, potassium absorbing significantly, close to nitrogen levels, at which time the absorption ratio of nitrogen, phosphorus and potassium is 1:0. 3 :0. 9。
(4) phase iv
During the high yield period, the fruits of the second and third stages of the tropics enter a period of expansion and maturity, the absorption of nitrogen drops and the absorption of phosphorus and potassium increases, with the highest absorption of potassium, at which time the absorption ratio of nitrogen, phosphorus and potassium is approximately 1:04:1. 7. The test results showed that the intake of nitrogen (n), phosphorus (p2o5) and potassium (k2o) per strawberry was 2. 0 g, 0. 9 g and 2. 5 g, respectively, and calculated that the fertilizer intake of nitrogen per 1000 m2 strawberry was 16-20 kg, phosphorus 7. 9 kg and potassium 20-25 kg。
Pneumonia fertilizers are applied prior to planting at a rate of 5-10 m3 per acre for high-quality farmers, 50 kg of potassium nitrogen phosphorus compound fat and 60 kg of calcium per phosphate. Following the commissioning of the plant, 7 ~ 10 composite fattenings of nitrogen phosphorus were pursued, 5 kg per acre, 1 fertilization was applied each during the current, flower-preservation, flower-sitting and harvest periods, followed by 3 ~ 6 – depending on the size of the plant and the result。
