Yield, Lint and Yarn Quality Properties of Some Egyptian Cotton Varieties as Affect By Some Natural Extracts and Mineral Fertilization Rates

A field experiment was conducted at the Experimental Farm of Sakha Agricultural Research Station (Kafr El-Sheikh Governorate), Agricultural Research Center, Egypt, during two successive seasons of 2019 and 2020 to study the performance of two Egyptian cotton varieties, i.e., Giza 94 and Giza 97 as affected by foliar spray with natural extracts and mineral fertilization rates, i.e., control (full dose of mineral fertilization rates with 60 kg N, 30 Kg P₂O₅ and 48 kg K₂O/fed [A], 75 % A and foliar spray of compost tea, 75 % A and foliar spray of algae extract, 75 % A and foliar spray of compost tea with algae extract, 50 % A and foliar spray of compost tea, 50 % A and foliar spray of algae extract and 50 % A and foliar spray of compost tea with algae extracts on cotton vegetative growth, yield components, yield, fiber and yarn properties. The experiments were laid out in Randomized Complete Block Design (RCBD) with four replicates. Growing the promising cotton variety of Giza 97 significantly gave the maximum mean values of No. of sympodial/plant, No. of opened bolls/plant, boll weight, lint %, seed cotton yield/fed, lint cotton yield/fed, upper half mean length, length uniformity index, fiber bundle strength, fiber elongation %, micronaire value, fiber yellowness degree and lea count strength product in addition to produce the lowest mean values of plant height, fiber brightness degree, yarn unevenness/100 m and No. of neps/100 m in both seasons. The highest mean values of plant height, No. of sympodial/plant, No. of opened bolls/plant, boll weight, lint %, seed cotton yield/fed, lint cotton yield/fed, upper half mean length, fiber bundle strength, fiber elongation %, micronaire value, fiber brightness degree and lea count strength product in addition to the lowest fiber yellowness degree and No. of neps/100 m were obtained from Egyptian cotton plants treated by 75 % A and foliar spray of compost tea with algae extracts, followed by 75 % A with foliar spray of algae extract treatment in both seasons. Egyptian cotton variety of Giza 97 when received 75 % A and foliar spray of compost tea with algae extracts produced the highest mean values of No. of sympodial/plant, No. of opened bolls/plant, boll weight, lint %, seed cotton yield/fed, lint cotton yield/fed, fiber bundle strength, micronaire value and lea count strength product as well as recorded the lowest mean values of No. of neps/100 m in the first and second seasons. Based on the previous results it could be concluded that, growing promising cotton variety of Giza 97 treated by 75 % A along with foliar spray of compost tea and algae extract treatment produced the maximum seed cotton yield and  lint cotton yield as well as the properties fiber and yarn have improved.