Soil testing is the best way to determine accurately fertilizer needs for cotton. Fertilizer recommendation are as range, low for fertile soils and high for poor soil fertility. The previous crop, soil textures, irrigation, rainfall should be taken into consideration for fertilizer decisions.
Province
Type
Nitrogen
Phosphate (Kg/Ha)
Potash
Timing
Punjab
120-170
60
Sind
90-140
50
Source: Federal institutes (PARC, NFDC) and the fertilizer industry compile this information for the farmers in Pakistan under FAO project and published in http://www.fao.org/3/y5460e/y5460e00.htm#Contents
All P2O5, K2O and 1/3 of the N should be applied at sowing by band placement.
Then 1/3 of the N should be applied with the first irrigation and the remaining 1/3 of the N at the pre-flowering stage.
If phosphate was not applied at sowing, it should be top dressed along the lines before the first irrigation.
In case the wheat crop is fully fertilized with phosphorus and the soil test value is above 10.0 mg/kg, then P2O5 application to cotton can be reduced.
Potassium and micronutrients (boron) should be applied on the basis of soil analysis. Boron is important for cotton, but one has to be careful because the difference between deficiency and toxicity is very narrow.
http://www.fao.org/3/y5460e/y5460e00.htm#Contents
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