DIFFERENCES IN EFFECTS OF HPS AND LED ON CROPS
-Author ：LeDinPro
2019 /2/12
The researchers pointed out that the light required for photosynthesis in plants, with wavelengths ranging from 400 nm to 700 nm. Especially in the blue and red regions, is closest to the efficiency curve of plant photosynthesis. They believe that growers can use LED grow lights to combine specific wavelengths of light as needed to convert light into photosynthetically active radiation. It not only can increase plant yield but also controls wavelengths that are ineffective for plant growth. In addition, relevant experiments were conducted to test whether led grow light can reduce the lighting cost of greenhouse cultivation.
1.Yield and quality differences
The high yield and high quality of crops is the ultimate goal of planting and cultivation. The light supplementation of LED can improve the quality of pepper, tomato and eggplant seedlings; the yield of single fruit and the yield per plant of tomato under 10h light supplementation are obvious. The yield increase effect of LED fill light is also manifested in cucumber planting. LED can also improve the quality of grapefruit, in which blue light can make fruit grow faster, fruit has higher single grain quality and higher sugar content; ultraviolet light can make single fruit the largest when the fruit matures.
Similarly, the 70W HPS obviously has an effect on the yield per plant of strawberry, and the yield increase can reach 17.9%. HPS and Led grow lights have a significant effect on the morphology of the plants. The color of cucumber is also improved by the side light filling treatment of the Led grow lights. The LED is added on the basis of the HPS, and the color of the cucumber is more vivid than the treatment with only the HPS.
2.Plant morphology index difference
The morphological indicators of plant are important indicators in the process of plant growth, especially in seedling production, which determines whether plants can grow healthily after transplanting.
Under normal circumstances, conifer plant seedlings under LED growth have better growth than HPS. The greenhouse tomato variety 'Maxifort' was pre-filled with 61±2μmol/(m2·s) HPS, natural light and 3 different ratios of red and blue led grow lights. It was found that the leaf area and number of leaves of tomato under 95% red light +5% blue led grow light were higher than the HPS.
The effect of led grow light on the plant height, stem diameter and leaf area of watermelon grafted seedlings were better than that of HPS treatment. These results indicate that the leaf growth of the plant is higher than that of the HPS when the spectrum of led grow light is suitable.