Response of bell pepper crop subjected to irrigation depths calculated by different methodologies

ABSTRACT Water must be supplied to a crop in the proper amount and in a timely manner. Vegetables require a good water availability in soil during their entire cycle. Thus, it is very important the implementation of an irrigation management and accurate estimation of water requirement. The objective of this work was to evaluate the effect of five irrigation depths estimated by the dual-Kc and single-Kc methodologies on the characteristics of growth, production and water use efficiency in the pepper crop. A randomized block design was adopted in a split plot arrangement. The effect of five irrigation depths (50, 75, 100, 125 and 150% of crop evapotranspiration - ETc) was evaluated in the plots, and the methodologies were evaluated in the subplots. It was evaluated the root dry matter, total fruit production, leaf temperature, number of aborted flowers and water use efficiency. The interaction between both effects was not significant for any of the variables. The effect of methodology was observed only on the number of aborted flowers. The effect of the irrigation depths was significant on all variables. The irrigation depths that lead to the best agronomic characteristics were superior to 100% of ETc. The ratio between the irrigation depths estimated by single-Kc and dual-Kc methodologies was 1.14. Single-Kc methodology and irrigation depth of 143% ETc were more suitable for the horticulturist. The most efficient irrigation depth in the use of water was 105% ETc

Capacidade combinatória de sete caracteres de resistência de Lycopersicon spp. à traça do tomateiro

Com o objetivo de estudar as capacidades específica e geral de combinação (CEC e CGC, respectivamente) entre dois grupos de Lycopersicon spp., obtiveram-se híbridos interespecíficos de tomateiro utilizando-se o modelo de cruzamento dialélico parcial. Foram avaliadas sete características de resistência destes grupos ao ataque de Tuta absoluta. Foram observadas diferenças significativas quanto a maioria das características com relação às capacidades geral e específica de combinação. Baseado na CGC, os genótipos Ângela, Santa Clara, LA 716, e LA 1777 são os parentais mais indicados a serem incluídos em programas de melhoramento do tomateiro que visem aumentar a resistência a T. absoluta. As combinações híbridas com maiores valores conjuntos de CEC e heterose foram Ângela x PI 126445, Ângela x PI 127826, IPA-5 x LA 1777, e Santa Clara x LA 716.Using the partial diallel methodology, interspecific hybrids of tomato were obtained, in order to study the general and specific combining abilities (GCA and SCA, respectively) between two groups of Lycopersicon spp. Seven characteristics of tomato resistance to Tuta absoluta were evaluated. Significant differences regarding the majority of the evaluated traits were observed. Based on GCA, the genotypes Ângela, Santa Clara, LA 716 and LA 1777 are the most indicated to be used in a breeding program to improve the tomato resistance to T. absoluta. The best hybrids, considering SCA and heterosis, were Ângela x PI 126445, Ângela x PI 127826, IPA-5 x LA 1777 and Santa Clara x LA 716

Response of bell pepper crop subjected to irrigation depths calculated by different methodologies

<div><p>ABSTRACT Water must be supplied to a crop in the proper amount and in a timely manner. Vegetables require a good water availability in soil during their entire cycle. Thus, it is very important the implementation of an irrigation management and accurate estimation of water requirement. The objective of this work was to evaluate the effect of five irrigation depths estimated by the dual-Kc and single-Kc methodologies on the characteristics of growth, production and water use efficiency in the pepper crop. A randomized block design was adopted in a split plot arrangement. The effect of five irrigation depths (50, 75, 100, 125 and 150% of crop evapotranspiration - ETc) was evaluated in the plots, and the methodologies were evaluated in the subplots. It was evaluated the root dry matter, total fruit production, leaf temperature, number of aborted flowers and water use efficiency. The interaction between both effects was not significant for any of the variables. The effect of methodology was observed only on the number of aborted flowers. The effect of the irrigation depths was significant on all variables. The irrigation depths that lead to the best agronomic characteristics were superior to 100% of ETc. The ratio between the irrigation depths estimated by single-Kc and dual-Kc methodologies was 1.14. Single-Kc methodology and irrigation depth of 143% ETc were more suitable for the horticulturist. The most efficient irrigation depth in the use of water was 105% ETc.</p></div