O presente estudo foi conduzido com o objetivo de avaliar o comportamento inicial de plântulas de Theobroma grandiflorum (Willd. ex Spreng.) Schum. (cupuaçu), em função de diferentes níveis de sombreamento. Ao final de 50 dias, após a emergência, as plântulas de cupuaçu foram submetidas a três níveis de sombreamento, sendo: 0% de sombreamento, 50% de sombreamento e Sombra Natural. O crescimento das mudas foi conduzido em delineamento de blocos casualizados, com 15 repetições, sendo cada planta considerada como uma repetição. Foram avaliados a altura, o diâmetro e o número de folhas aos 60, 82, 103, 124, 145 dias após a emergência das plântulas. A Massa Seca de Folhas (MSF), Massa Seca do Caule (MSC), Massa Seca da Raiz (MSR) e Massa Seca Total (MST), Relação parte aérea/raiz (PA/R) e relação Altura da planta/Diâmetro do colo (A/D), foram avaliadas no final do experimento. O crescimento inicial de Theobroma grandiflorum foi corroborado com os padrões da espécie, que ocorre no interior das matas primárias, tendo melhor desenvolvimento dos parâmetros avaliados em condições de 50% de sombreamento. A condição de 50% de sombreamento pode ser recomendada para a formação de mudas de Theobroma grandiflorum, devido o seu melhor desempenho em altura, diâmetro, número de folhas e alocação de massa nas partes da planta. PALAVRAS-CHAVENível de sombreamento, Adaptação, Desenvolvimento inicial, Alocação de biomassa. Initial development of Theobroma grandiflorum (Willd. ex Spreng.) Schum. saplings under shading influence ABSTRACTThe objective of this work was to evaluate the initial growth of sapling of Theobroma grandiflorum (cupuaçú), in function of different levels of solar radiation. Fifty days, after the emergency, the saplings were submitted to three levels of shade, being: 0%, 50% and natural shade. Sapling development was carried out in randomized block design with 15 repetitions (15 saplings). The sapling height, lap diameter and the numbers of leaves being evaluated on the 60 st , 82 nd , 103 rd , 124 th , 145 days after sapling emergence. The Dry Mass of the leaves (DML), Dry Mass of the stem (DMS), Dry Mass of the root (DMR) and Dry mass of the plant (DMP), Relation shoot/root (PA/R) and relation plant height/Lap diameter, were measured at the end of the experiment, when the sapling reached the appropriate size to be planted in the field. The initial growth of Theobroma grandiflorum was corroborated with the species standard that occurs inside of the primary bushes, so its development of the parameters evaluated is better in conditions of 50% of shade. The condition of 50% of shade can be recommended for the formation of plants of Theobroma grandiflorum, which had the better performance in plant height, lap diameter, number and allocation of mass in the parts of the plant.
-The aim of this study was to evaluate the growth and yield of soybean cultivar M-8766 in consortium with Brachiaria brizantha. BRS Piata and Brachiaria ruziziensis at different densities and sowing dates. The experimental design was randomized blocks with treatments arranged in a factorial 2 x 2 x 3 with four replications. Used as factors grass species (Brachiaria brizantha Piata and Brachiaria ruziziensis BRS) intercropped with soybean M-8766, sowing dates (12 and 24 days after soybean emergence) and three seeding rates (0, 5, 10 kg ha -1 of seed). At 71 days after soybean emergence were evaluated plant height, stem diameter, dry mass of leaves, stems and shoots, and 4 months after sowing determined the weight of 100 grains and soybean yield. The results showed that when seeded at a density of 10 kg ha -1 at 12 and 24 DAE soy, Brachiaria brizantha. BRS Piata caused reduction in yield in the order of 6.71% and 3.03% respectively, while the Brachiaria ruziziensis was one that caused a greater reduction in productivity in the order of 13.42 and 16.23%, respectively, of these values expression when considering the price of soybean sack. B. ruziziensis expressed less competitive with soybean. However, the large biomass production of this grass provides deployment system till the next harvest.
Crescimento de Brachiaria brizantha cv. BRS Piatã consorciada com a cultura da soja sob diferentes densidades e épocas de semeadura Resumo -A utilização de forrageiras, principalmente do gênero Brachiaria, consorciadas com culturas a exemplo da soja, tem sido um mecanismo de recuperação de áreas degradadas. Nessa convivência se estabelece relação competitiva na qual a época de semeadura e a densidade são fatores determinantes no crescimento delas. Dessa maneira, objetivou-se com este trabalho avaliar o crescimento e a produção da Brachiaria brizantha cv. BRS Piatã semeada em consórcio com cultura da soja RR cv. M-8766, sob diferentes densidades e épocas de semeadura. O delineamento experimental foi em blocos casualizados, em esquema fatorial de (2 x 4 x 8) + 4, com quatro repetições, correspondendo a duas épocas de semeadura (20 e 30 dias após a emergência da soja (DAE)), quatro densidades (3, 6, 9 e 12 kg de semente ha -1 ) e oito épocas de avaliação, além de quatro densidades de braquiária crescida isoladamente, consideradas como testemunha. A presença da soja impôs redução expressiva no crescimento da gramínea, principalmente na semeadura mais tardia. Maiores incrementos nas variáveis avaliadas foram constatados após 110 dias de crescimento da soja. As variáveis da Brachiaria brizantha cv. BRS Piatã mais afetadas pela presença da soja foram número de perfilhos, matéria seca da parte aérea e altura de plantas. Abstract -The forage use, mainly of the gender of Brachiarias, intercropped with cultures to example of the soy, has been a mechanism of recovery of degraded areas. In this, it settles down a competitive relationship in which the sowing time and the density are decisive factors in the growth of the same ones. Thereby, the objective of this work was to evaluate the growth and production of Brachiaria brizantha variety BRS Piatã sowed in intercropped with culture of the genetically modified soybean RR variety M-8766, under different densities and times of sowing. The trial was conducted in completely randomized blocks design, in a factorial scheme (2 x 4 x 8) + 4, with four repetitions, corresponding to two times (20 and 30 days after the emergency of the soybean(DAE)), four densities (3, 6, 9 and 12 kg of seeds ha -1 ), eight evaluation times and four seed densities of grass in pure cultivation, considered as control. The soybean presence imposed expressive reduction in the growth of Brachiaria brizanthacv. BRS Piatã, mainly in later planting. Larger increments in the evaluated variables were verified after 110 days of growth of the soybean. The variables of Brachiaria brizanthacv. BRS Piatã more affected by the soybean presence were tiller number, leaf dry matter and plant height. Palavras-chave -
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.