Produtividade E Crescimento Da Mamoneira Em Plantio Adensado Sob Diferentes Níveis De Irrigação

Abstract

Resumo: O anseio pela melhora da rentabilidade agrícola tem levado ao emprego de técnicas variadas que vinham sendo relegadas ao cultivo da mamoneira. Dentre estas, cita-se o adensamento e a irrigação. Assim, com o presente trabalho objetivouse avaliar características de produção e crescimento da mamoneira cultivada em espaçamento adensado e irrigada com base em diferentes níveis de tensão de água no solo. O experimento foi conduzido na área de pesquisa do setor de Agrometeorologia e Climatologia da Universidade Federal de Lavras, em Lavras -MG, no período de março a setembro de 2010. O espaçamento de plantio foi de 0,30 m entre plantas e 0,70 m entre linhas. Avaliou-se altura do caule, diâmetro de copa, peso das sementes com baga e peso das sementes sem baga. Utilizou-se o delineamento experimental de blocos casualizados, com cinco tratamentos e quatro repetições. Os tratamentos consistiram de: uma testemunha sem irrigação (T0) e da irrigação sempre que o potencial matricial a 0,20 m de profundidade atingiu os valores de 15 (T1), 30 (T2), 45 (T3) e 60 kPa (T4). O tratamento T1 foi o que apresentou maior produtividade e crescimento. A produtividade deste tratamento foi de 4700 kg ha -1 , enquanto a da testemunha foi de 460 kg ha -1 . Palavras-chave:Ricinus communis L. Safrinha. Espaçamento. Tensiômetro. Gotejamento. PRODUCTIVITY AND GROWTH OF THE CASTOR BEAN WHILE SUBJECTED TO HIGH PLANT POPULATION UNDER DIFFERENT IRRIGATION LEVELSAbstract: Presented as an alternative for biodiesel production without direct competition in the food market, the castor bean crop has received more attention in an attempt to improve agricultural profitability. Some techniques which had not previously been considered are now receiving increasing investigation, such as high density of plant population and irrigation. This present study aimed to evaluate castor bean yield and growth characteristics in the field with narrow row spacing, and under irrigation based on different levels of soil water tension. The research field was located in the Climatology and Agrometeorology sector, of the engineering department at the University of Lavras. The evaluated period was from March to September of 2010. The plant spacing was 0.30m between plants and 0.70m between rows. The stem height, plant diameter, seed weight with and without berry were evaluated. A completely randomized design with five treatments and four replications was used. Treatments were without irrigation (T0); and irrigation starting at soil matric potential values of 15 (T1), 30 (T2), 45 (T3), and 60 kPa (T4). Treatment T1 presented the highest yield and growth. This treatment showed 4700 kg ha -1 and the control without irrigation just 460 kg ha -1 .

IDENTIFICATION OF Ricinus communis HYBRIDS FOR LOW PLANT HEIGHT1

“…Abimiku, State and Ndor (2012) also reported positive correlations between PH and NHR. However, the objective of reducing plant height is to increase the yield per area due to the higher populational density, and favor mechanized harvest, as also described by Carvalho et al (2010); Soratto et al (2011), andMiranda et al (2017).…”

“…The cultivation of castor bean (Ricinus communis L.; Euphorbiaceae) has high economic, social, and environmental importance; it is grown mainly for the oil extracted from its seeds, which is useful mainly for the manufacturing of biofuels and cosmetic and pharmacochemical products (MIRANDA et al, 2017;RUKHSAR et al, 2018). The largest castor bean producing countries are India, Mozambique, China, and Brazil.…”