Response to Pix of cotton varieties in Greece
Feb 11, 2019
The climatic conditions in Greece, especially in the north of the country, limit crop duration. Maturing the crop early is frequently needed to avoid the risk of rain and cool temperature at the time of harvest. In these conditions it is important to secure the bottom and the first position bolls on the plants. The studies conducted in Greece during the last three years indicate that among the different techniques inducing earliness, the split use of a plant growth regulator (PGR) namely Pix, not only limits plant height but also induces early fruit set, better bottom boll production and earliness. The plant mapping technique is of great interest to ensure precise field follow up from early plant development to harvest. Preharvest mapping has given a clear indication of the plant production structure with different Pix application regimes. The best results were obtained either with three applications starting at pinhead square, i.e. 60 days after planting (DAP), then first flower (70 DAP) and 7 to 10 days later at the rate of 250, 250, 500 ml per hectare, respectively, or two applications 70 and 80 DAP at the rate of 500, 500 ml per hectare. Higher average yield (25%) and earlier maturity (one week) were obtained on two sites.