Microclimate suitability for green and coloured sweet pepper hybrids in open and protected structures in sub-tropical humid climate of West Bengal

Abstract

A study was undertaken for two consecutive seasons (autumn-winter) to evaluate the performance of three green, red and yellow-fruited sweet pepper hybrids in open field and under two protected structures (50% green shade net house and naturally-ventilated polyhouse) to understand the microclimate suitability for maximizing the productivity of these hybrids under sub-tropical humid climatic condition of eastern India. In this climatic condition, naturally-ventilated polyhouse was most suitable for enhancing fruit yieldof both green and coloured fruited hybrids. Open field condition was not suitable for both yellow and redfruited hybrids. Though green-fruited hybrids could be grown in open field condition, fruit yield was more than double under polyhouse. Shade net house could not be considered as a suitable protected structure for sweet pepper in this climatic condition because of reduced light intensity and high relative humidity inside it causing low fruit set and high incidence of bacterial wilt disease. Maximum/minimum temperature30oC to 33oC / 14oC to 17oC with comparatively reduced light intensity of 35,000 to 55,000 lux, prevention of adverse effect of low night temperature during winter and  60 per cent relative humidity condition during flowering, fruit set and fruit development period inside the naturally ventilated polyhouse were most suitable growing conditions for getting maximum productivity of both green and colour-fruited hybrids of sweet pepper.

Effect of Temperature and Humidity on Milk Urea Nitrogen Concentration

“…Including these cows in the analysis makes the findings of this study relevant to typical dairy farms. Mean maximum temperatures and humidity were typical of humid subtropical climates [30].…”

Estimation of genetic parameters and variability of various cayenne peppers under net shading

“…A positive and significant correlation existed between fruit weight and the number of fruits on yield per plant in pepper (Iwo et al 2016;Esho 2019). Samanta and Hazra (2019) reported a significant and positive correlation between fruit weight and the number of fruits on yield per plant in sweet peppers both in open fields and under shading nets. Ritonga et al (2018) reported a significant and positive correlation between fruit weight and fruit number per plant on yield in tomatoes under 50% plastic net shading condition.…”

“…The microclimate during the study was classified as less than optimum to optimum for chili cultivation. The optimum light intensity in chili ranged from 35,000-50,000 lux with a daytime temperature of 30-33 o C on the C. annuum (Samanta and Hazra 2019). Low light intensity stress on tomatoes (including nightshade plants) occurs at the lux light intensity of 32,000 (Sulistyowati et al 2016).…”

“…Plastic shade that is too low in shade level does not become a stress for chili plants, while plastic net shade that is too high causes low production of all chili genotypes. Samanta and Hazra (2019) reported that all chili genotypes experienced a decrease in production when shaded <35,000 lux (75% shade level). Sulistyowati et al (2016) reported that a plastic net of 50% shading condition was the best selection environment for selecting shade-tolerant genotypes in tomatoes.…”