*11.1.3 One-time fertilization technique*

The three main cotton-growing regions of China rely on light, easy, and effective fertilization, with the amount of fertilizer used determined by the output of the cotton. The appropriate amount is 225–240 kg/ha for high-yield fields with an area of 3750 kg/ha or higher, and the N:P2O5:K2O ratio is roughly 1.0:0.6:0.7–0.9. The yield of seed cotton in the northwest inland cotton area is between 4500 and 5250 kg/ha, and 280 to 330 kg/ha of N is the appropriate amount. The N:P2O5:K2O ratio is roughly 1.0 0.5:0-0.3, and it can be decreased by 15% by integrating water fertilizer. The other is lowering the frequency of fertilization by applying cotton special slow-release fertilizer. The Yangtze River Valley cotton area uses a one-time basal application of controlled or slow-release fertilizer; 10–20% less slow-release fertilizer can be equivalent to the standard fertilization dosage.
