Cotton Heat Stress

摘要: Heat stress has been a subject of considerable concern among Arizona cotton growers due to recent string hot, humid summers. Research studies indicate heat develops when mean crop temperature exceeds 82.4F (28C). Serious temperatures exceed 86E Several meteorological factors impact in Arizona; however, accurate estimates ofcro; can be made using model requiring air and dew point temperature. This was used evaluate conditions over the past 10 years. Results from this evaluation show three years were difficult for stress. Elevation humidity levels are major impacting any given year. Lower elevation areas more prone than high such as Safford. Possible management options minimize include early optimal planting dates, variety selection, field location good water management. Introduction assigned much blame relatively poor yield performance low desert crops The authors article have working on various aspects production four following provides an overview our findings current understanding how impacts cotton. Defining Cotton Stress A true definition is fairly obtain scientific literature. For example, work Mississippi indicates that Upland grown controlled environments retains little fruit with day equal 95F night 77F (1). Such results would severely questioned by who repeatedly produce yields even 110F. key results, focus attention temperature, not Crop generally run close portions belt; thus, may actually at reads 95F. arid southwest present different situation. well below ambient; often, -15F during daytime (Figure 1). Therefore, understand intensity one must able convert into From 1993 through 1995 we conducted several field. In these infrared thermometers collect data throughout primary bloom cycle DPL5415. developed which daily average standard collected AZMET stations. including solar radiation, humidity, wind movement cloud cover. However, simple requires only temperatures. An example output presented Figure 2 selected maximum minimum regimes.