What is the best formula to use when applying basal fertiliser to cotton?

As cotton has a long fertility period, it is important to apply sufficient fertiliser in order to ensure that cotton has the right nutrient requirements throughout its reproductive life. Organic fertilisers should be used as the main fertiliser, with the right amount of chemical fertilisers, and organic fertilisers are commonly used in cotton fields, mainly as stable manure and compost. The amount of organic fertiliser is related to soil fertility, fertiliser quality and yield. Soil fertility, fertilizer quality less, and vice versa more. Northern cotton fields with organic fertilizer 15 tons / ha or green manure 11.25 - 22.5 tons / ha, the conditions of the place and then apply cake fertilizer 750-1125 kg / ha. Low-yielding cotton fields can be fertilised by applying chemical fertilisers to promote organic fertilisation. Generally, under the premise of applying 112.5-150 kg/ha of total nitrogen, 37.5 kg/ha of pure nitrogen is used as base fertiliser (the rest 75-112.5 kg/ha is used as chasing fertiliser during the bolling period), and organic fertiliser is mixed and scattered after deep ploughing and turning, which is effective. For loamy soils of medium to high fertility, with a strong capacity for fertiliser storage and supply, nitrogen fertiliser is best applied in two applications, i.e. 45% as a base fertiliser and 55% as a follow-up fertiliser during the flowering period. Soil fertility is poor, sandy texture, low fertilizer capacity of cotton fields, nitrogen fertilizer can be applied in three applications, that is, 30% of the base fertilizer, 20% of the boll chasing fertilizer, 50% of the boll chasing fertilizer. For Xinjiang inland cotton areas and less rainfall to irrigation-based dryland cotton fields, in order to reduce the labour input of fertilizer, all fertilizer for the base fertilizer application effect is better.

The amount of phosphorus and potassium fertiliser used as base fertiliser is based on the level of phosphorus and potassium content in the soil, and the ability of the soil to retain fertiliser needs to be taken into account. For soils with a strong fertiliser retention capacity and a relatively heavy texture, phosphorus and potash can all be used as a base fertiliser; sandy loamy soils or sandy soils with a weak fertiliser retention capacity can also be left with a portion of potash as a chaser. As cotton is a straight root system, deeper into the soil, the application of base fertiliser should pay attention to moderate deep application. Phosphate fertiliser can be applied as a full layer or mixed with farmyard manure and composted and then spread over the whole layer. Generally apply 600-750 kg of calcium superphosphate (P20575 a 105 kg) per hectare. When the amount of base fertiliser is small, to improve the effect of phosphorus and potash, it can be applied in strips under the rows of planting rows. The soils of the southern cotton areas of China are generally deficient in potassium and the soils of the northern cotton areas are less deficient in potassium, but in recent years some cotton fields in the north have had a significant effect of potassium application. On the basis of the application of nitrogen and phosphorus, 135-150 kg of potassium chloride or sulphate per hectare is applied to medium and upper middle-lying cotton fields; 225 kg of potassium chloride or sulphate per hectare is applied to lower middle-lying cotton fields.

As cotton has a long fertility period, it is important to apply sufficient base fertiliser to ensure that the nutrient requirements of cotton are met throughout its reproductive life. Organic fertilisers should be used as the main fertiliser, with an appropriate amount of chemical fertilisers, and organic fertilisers are commonly used in cotton fields, mainly as stable manure and compost. The amount of organic fertiliser is related to soil fertility, fertiliser quality and yield. Soil fertility, fertilizer quality less, and vice versa more. Northern cotton fields with organic fertilizer 15 tons / ha or green manure 11.25 - 22.5 tons / ha, the conditions of the place and then apply cake fertilizer 750-1125 kg / ha. Low-yielding cotton fields can be fertilised by applying chemical fertilisers to promote organic fertilisation. Generally, under the premise of applying 112.5-150 kg/ha of total nitrogen, 37.5 kg/ha of pure nitrogen is used as base fertiliser (the rest 75-112.5 kg/ha is used as chasing fertiliser during the bolling period), and organic fertiliser is mixed and scattered after deep ploughing and turning, which is effective. For loamy soils of medium to high fertility, with a strong capacity for fertiliser storage and supply, nitrogen fertiliser is best applied in two applications, i.e. 45% as a base fertiliser and 55% as a follow-up fertiliser during the flowering period. Soil fertility is poor, sandy texture, low fertilizer capacity of cotton fields, nitrogen fertilizer can be applied in three applications, that is, 30% of the base fertilizer, 20% of the boll chasing fertilizer, 50% of the boll chasing fertilizer. For Xinjiang inland cotton areas and less rainfall to irrigation-based dryland cotton fields, in order to reduce the labour input of fertilizer, all fertilizer for the base fertilizer application effect is better.

The amount of phosphorus and potassium fertiliser used as base fertiliser is based on the level of phosphorus and potassium content in the soil, and the ability of the soil to retain fertiliser needs to be taken into account. For soils with a strong fertiliser retention capacity and a relatively heavy texture, phosphorus and potash can all be used as a base fertiliser; sandy loamy soils or sandy soils with a weak fertiliser retention capacity can also be left with a portion of potash as a chaser. As cotton is a straight root system, deeper into the soil, the application of base fertiliser should pay attention to moderate deep application. Phosphate fertiliser can be applied as a full layer or mixed with farmyard manure and composted and then spread over the whole layer. Generally apply 600-750 kg of calcium superphosphate (P20575 a 105 kg) per hectare. When the amount of base fertiliser is small, to improve the effect of phosphorus and potash, it can be applied in strips under the rows of planting rows. The soils of the southern cotton areas of China are generally deficient in potassium and the soils of the northern cotton areas are less deficient in potassium, but in recent years some cotton fields in the north have had a significant effect of potassium application. On the basis of the application of nitrogen and phosphorus, 135-150 kg of potassium chloride or sulphate per hectare is applied to medium and upper ground cotton fields; 225 kg of potassium chloride or sulphate per hectare is applied to lower and medium ground cotton fields.