1. Calculate the lint price first. The general formula at present is: lint price = {seed cotton price-cottonseed price x( 1- lint percentage -0.0 1) bu (lint percentage -0.0 1)X2000.

2. Seed cotton price = lint price * lint percentage +( 1- lint percentage) * 98% * cottonseed price-processing fee.

3. Seed cotton price = lint price * lint percentage+cottonseed price *( 1- lint percentage -2%- processing fee.

4. The formula is as follows: the purchase price of standard-grade seed cotton = (storage price of standard-grade lint cotton-processing cost) x seed cotton trial-rolling coat fraction+(seed cotton trial-rolling coat fraction-processing loss) x wool cottonseed price, where: the processing cost is generally 1 1,000 yuan/ton (including procurement cost, processing cost, financial cost and short-distance freight); Processing loss is generally calculated as 1.5% (including cottonseed loss and clothing loss).

5. Lint percentage: refers to the percentage of lint obtained by a leather roller or a sawtooth trial mill in the weight of the trial-rolled seed cotton sample when purchasing seed cotton, also called sweater percentage. Mainland cotton is generally 35-38%, and Xinjiang cotton is slightly higher, reaching 38-42%. Lint percentage is mainly related to cotton varieties and growth conditions. The higher the lint percentage, the higher the lint yield. Regardless of moisture regain and impurity content, it is called sweater percentage.

6. Moisture regain: The moisture regain of cotton refers to the percentage of moisture contained in wet cotton in the weight of dry cotton. Due to the different geographical location and collection season, the moisture regain varies greatly. The official moisture regain of cotton is 8.5%, and the maximum moisture regain of cotton is 10.0%. Cotton with 10.0% or more needs to be dried or dried before processing.

7. Impurity rate: the percentage of impurities contained in cotton in the weight of cotton. The standard impurity content of cotton is 3.0% for leather roller cotton and 2.5% for serrated cotton.

8. Loss rate: The loss (mainly broken) of cottonseed purchased with cotton is about 1% of the weight of seed cotton, accounting for 1.5~ 1.7% of the total cottonseed contained in raw cotton.