Evaluation of castor bean genotypes sown in winter and summer at a low altitude

Abstract

ABSTRACT. Current demands for the genetic breeding of castor bean include the adaptation of genotypes to low altitudes to expand the potential areas of cultivation. This study was conducted to evaluate the response of different genotypes of castor bean that were sown in winter and summer at a low altitude. The study was conducted in northwestern Rio de Janeiro State at an altitude of 60 m. The treatments consisted of genotypes IAC 80, AL Guarany 2002, BRS 149 Nordestina, BRS 188 Paraguaçu, Savana, Lyra, Mirante 10, IAC 226, Cafelista, G1, V1, and T1 with spaces of 2.0 m between rows, 1.0 m between plants, and one plant per hole. The plant height, number and length of racemes, number of fruits per raceme, seed yield, and incidence of gray mold were determined. The highest yields in both seasons were obtained by the genotypes BRS 149 Nordestina, G1, BRS 188 Paraguaçu, and IAC 226. The genotypes Savannah and Lyra had the lowest yields in both cultivation seasons. The genotypes responded differently to the environmental conditions depending on the growing season, and the spring-summer period was found to be more favorable at the low altitude of the study site.

Influence of Spacing and Dates of Sowing on Performance of Castor Hybrids in Rainfed Areas of Chitradurga

“…Among the dates of sowing June second fortnight recorded significantly higher number of spikes (6.77) over June second fortnight (5.69). Lopes et al, 2014 andReager et al, (2016).…”

A site suitability analysis for castor (Ricinus communis L.) production during Brazil's second harvest incorporating disease prediction

“…Past research has shown that castor performs best in well-drained soils. Castor growth is best suited to soils with good drainage [ 20 , 21 ] and high pH soils; however, castor can tolerate soil pH values between 5 and 8 [ 22 ]. The second most important factor was soil pH.…”

Site suitability analysis incorporating disease prediction in castor (Ricinus communis L.) production

“…Castor grows best in a sandy loam to loam soil [25]. One reason that castor grows best on these soils is because they are well drained, which castor needs [10,11]. Also, castor has a high oxygen requirement and its root system is sensitive to hypoxia [26].…”

“…Although castor is relatively easy to grow, there are some major environmental limitations to its production in the USA. Some of the major environmental barriers to castor production are temperature, precipitation, soil type/characteristics, disease (especially Botryotinia ricini), and land cover [5,[7][8][9][10][11]. By determining where these factors will limit castor production, breeding efforts can be addressed to overcome these limitations.…”