Evaluation the productivity of Egyptian cotton under climatic conditions and growth stimulates

Abstract

Cotton is grown in different locations in Egypt, which different climatic conditions (temperature and relative humidity) from location to another and from year to year in the same area. Climatic conditions affected significantly on growth, productivity and quality of cotton. The experiments were carried out at three Research Station farms, Giza, Sids and Mallawi, Cotton Research Institute, Agricultural Research Center, Egypt, during 2020 and 2021 seasons to evaluate the productivity of Giza 95 cotton variety under climatic conditions and growth stimulates (potassium silicate, proline and gibberellins) in three different locations and study their effects on leaves chemical constituents, growth and yield. Each experiment was planted under randomized complete block design with four replications for growth stimulates sprayed at 400 ppm concentration at squaring, beginning and top flowering stages and untreated plants. The combined analyses were used for all collected data (seasons, locations and growth stimulates). The results showed that years significantly affected by the variation in total amount of heat units, which 2021 growing season was lower than 2020 season, this led to season 2021 significantly increased all characters under study. Sids location gave the highest significantly value in all study characters, then Giza and Mallawi locations. Spraying proline recorded the maximum values of all study characters, then sprayed potassium silicate and gibberellins. The highest yield for Giza 95 cotton variety were obtained in season 2021 when plants sprayed by proline in Sids location.