Leaf area index assessment for tomato and cucumber growing period under different water treatments

Abstract

The aim of this study was to assess the leaf area index (LAI) of tomato and cucumber using an AccuPAR-LP-80-ceptometer to find the influence of irrigation. LAI was also determined by destructive sampling for comparison. The research was conducted at the Liaoning Water Conservancy Institute, North China in 2016. A randomized block design was used to test the influence of four treatments corresponding to field water capacity. Full irrigation (W<sub>1.0</sub>), 15% (W<sub>0.85</sub>), 25% (W<sub>0.75</sub>) and 35% (W<sub>0.65</sub>) water deficit were applied using the drip system. Regression model was developed to estimate LAI in response to irrigation. The results show that there is no difference between the two methods. The highest LAI obtained for tomato and cucumber was 5.21 and 3.21 m<sup>2</sup>/m<sup>2</sup>, respectively, with W<sub>0.85</sub> at 70-days after transplanting, which corresponds with destructive results. This result was found 11% higher and equal compared with W<sub>1.0</sub> for tomato (4.62) and cucumber (3.21), respectively. For both crops, LAI was found significantly influenced at 50-days after transplanting. It also indicated that LAI significantly influenced (by 15%) deficit irrigation for both crops and methods that achieved the highest yield. The predicted LAI was obtained best-fitting with the observed values, which indicated that the AccuPAR-ceptometer is suitable to be used.

Effects of Gibberellic acid, micronutrient fertilizer and Calcium nitrate foliar fertilizer on growth and yield of tomato Solanum lycopersicum L. cultivated in Vietnam

“…After the harvesting, the highest LAI value was recorded at 3.71 (m 2 /m 2 ) in F5, followed by F8 (3.68 m 2 /m 2 ). These results were in agreement with those of Hossain et al (2017) on tomato LAI [22].…”

“…There is a close connection between the leaf area index (LAI) and plant photosynthesis. Cultivars with higher leaf area index often gain higher yield production, although the structures of plant populations have a great influence on this index value [22]. If the leaf area index is recorded high, but the population is unreasonably structured, the leaves will shade each other, leading to a decrease in photosynthesis while the demand for respiration increases.…”

Deep fertilization with controlled‐release fertilizer for higher cereal yield and N utilization in paddies: The optimal fertilization depth

“…The higher sink benefited from the tillering characteristics and chlorophyll content (SPAD) at jointing stage, differences apparent but not statistically significant. It is also well known that the crop growth rate during the late reproductive period of the crop is positively correlated with the yield, which is directly correlated with the leaf photosynthetic capacity (Mamun Hossain et al, 2017;Takai et al, 2006). Here, CRBF application treatment significantly increased the chlorophyll content of top second leaf (SPAD), length, and width of the functional leaves at heading stage, ensuring the accumulation of photosynthate at the late stage of the crop; this finding is in agreement with previously reported results (Xing et al, 2015; Zhu , 2019).…”

Enhanced Production of Active Photosynthetic and Biochemical Molecules in Silybum marianum L. Using Biotic and Abiotic Elicitors in Hydroponic Culture

“…Increased flavonoid and antioxidant activity were also observed in a study of blackberries by [ 94 ]. MeJA can regulate the expression of flavonoid genes in response to wounds, leading to increased flavonoid concentration [ 95 ]. MeJA is involved in the formation of 4-coumaryl coenzyme-A, which, when combined with malonyl coenzyme-A, forms naringeninchalcone in the presence of the enzyme naringeninchalcone synthase.…”