Evaluation of Irrigation System by Balance and Integrated Solar Radiation on Fruit Quality of Muskmelon in a Closed Perlite Culture System

摘要

Three types of irrigation treatments were set up to evaluate the irrigation management by hanging balance and integrated solar radiation (ISR) in a closed perlite culture system Two irrigation regimes were controlled by hanging balance at two drainagerates; high and low levels were between 10-15% (dr-H) and 1-5% (dr-L), respectively. Another regime was controlled by specific ISR of 576 kJ center dot m~(-2). The weighing system could control the amount of irrigation accurately up to 0.05 kg. The amount of irrigated solution by balance was high in dr-H and low in dr-L. The amount of irrigated solution by ISR was more on the day of daily ISR of 166 MJ center dot M~(-2) than 11.3 MJ m~(-2). The water content in perlite controlled by balance was steadily maintained on the level of 26% in di-H, and 22% in dr-L during the irrigation period, whereas the water content in perlite controlled by ISR varied greatly between about 23 to 26% Drainage rate was very different among the treatments as 143% in dr-H and 51% in ISR-576 on the day of daily ISR of II 3 MJ center dot m~(-2) Soluble solid content was high in ISR-576 and low in dr-L. Fruit fresh weight was higher in dr-H than that in other treatments Accordingly irrigation management by balance in perlite culture in a closed system seems to be good for fmit quality and economic use of water and nutrient solution.