Application of organic compounds in cotton balances its vegetative and reproductive growth, as well as to improve the seed cotton yield and lint quality properties. Field experiments were conducted with some organic compounds to determine their effects on cotton yield and quality properties of cotton under two sowing times.The experiment was conducted at Sakha Agricultural Research Station, Cotton Research Institute, Egypt in 2015 and 2016. In these studies, two sowing times viz. optimum and

more »

... ay sowing and two levels (200 and 400 ppm) of organic compounds viz. ascorbic, ascobine and salicylic acids were used. The results indicated that the optimum sowing date gave the largest area of single leaf at 90 and 120 DAS, as well as it induced an increase in dry weight (g) of plant organs at 120 DAS, while, the late sowing significantly reduced the leaves dry weight both at 90 and 120 DAS. Both seed cotton yield and lint cotton yield (kentar feddan-1) were significantly increased in optimum sowing condition and sharply declined as delayed sowing date. The number of opened bolls plant-1 were also significantly reduced in late sowing. Lint percentage, seed index and seed cotton weight boll-1 were also significantly affected by sowing dates. Leaf pigment (total chlorophyll) was significantly affected by sowing date recorded at 90 and 120 DAS, while lower values of total chlorophyll was recorded in late sown plants. Also, sowing dates had no significant effect on both oil and protein seed content. This study has shown that timely sowing of cotton seed and foliar application of ascorbic acid, ascobine or salicylic acid with concentration of 200 or 400 ppm at flower initiation stage and peak of flowering stage had significant positive effects on seed cotton yield and lint quality properties. According to these results it can be suggested that usage of organic compounds to improve the yield and quality properties, especially in late sowing for 'Giza 94' cotton cultivar at Kafr- Elsheikh district, Egypt.