不同光质对西瓜营养生长和果实品质的影响OA

To explore the optimal light wave combinations for facility watermelon cultivation,this study selected five light waves:Red(660 nm),blue(450 nm),green(520 nm),yellow(590 nm),and far-red(730 nm).Treatments were applied during the daytime(06:00-18:00)and nighttime(18:00-06:00),and their effects on watermelon growth indicators(plant height,stem diameter,chlorophyll content,etc.)as well as fruit quality(fruit mass,sugar content,nutrient content,flesh color,etc.)were systematically analyzed.The results showed that appropriate supplemental light treatment could enhance watermelon plant growth and improve fruit yield and quality.During the seedling stage,nighttime far-red light treatments at night were recommended.Among these,the far-red light had the highest plant height(123.05 cm),relative chlorophyll content(56.25 SPAD)were the highest treatment.From the vine elongation stage to before flower bud differ-entiation,full-day red light treatment were recommended.Among them,daytime red light treatment increased leaf relative chlorophyll content(67.21 SPAD)and promoted vine elongation(179.93 cm),while nighttime red light treatment increased vine diameter(7.45 mm),and nighttime green light treatment resulted in overall better plant growth.During the flowering stage,nighttime blue light treatments were recommended to increase flower number,but daytime red light treat-ment should be avoided as it significantly reduced flower number.Fromfruit set to maturation,daytime green light treat-ments were recommended.Daytime green light treatment increased leaf relative chlorophyll content(64.44 SPAD).In conclusion,choosing the appropriate combination of light quality can promote the growth of facility watermelons in early spring and provide scientific suggestions for supplementary lighting of facility watermelons.