Performance of upland rice cultivars at different sowing times: an alternative for crop rotation in low altitude Cerrado region, Brazil

Abstract

The adequacy of the best sowing times and the choice of rice cultivars is determinant for greater investment and return in upland rice cultivation. Thus, this study identified the best sowing time and the cultivar that expresses its yield potential, being adaptable and stable, in a low altitude Cerrado region. The study was conducted during the agricultural year 2016/17. The soil of the site is a typical clayey dystrophic Red Latosol. The experimental design was in randomized blocks, in factorial scheme with four sowing times in spring/summer season (October, November, December and February), each with eight upland rice cultivars (BRS Esmeralda, ANa 5015, ANa 6005, IPR 117, IAC 500, IAC 203, BRSGO Serra Dourada and ANa 7211) and four replicates. The following parameters were evaluated: days elapsed from emergence to flowering and harvesting, number of panicles m-2 , number of filled spikelets per panicle, thousand grain weight and yield. Analyzes of adaptability and stability were performed as well as the principal components analysis. Except for the hundred grains weight, sowing times and cultivars interacted significantly for all characteristics evaluated. The cultivar BRS Esmeralda was adapted and stable to the different sowing times, being the most productive mainly when sown in October. The high yields were correlated with better grain filling, according principal components analysis.

Nitrogen supply associated with the application of trinexapac-ethyl in upland rice irrigated by sprinkler

“…In the third year, there was more accumulated precipitation and better distribution ( Figure 1C), indicating that there were more cloudy days and, consequently, lower solar radiation incidence in relation to the second year ( Figure 1B). Meirelles et al (2019) reported that lower incidence of solar radiation reduces the photosynthetic process and leads to a decrease in the number of panicles m -2 in rice plants. Owing to the greater formation of panicles in the present study, there was less formation of spikelets per panicle, indicating possible competition within the plant for photoassimilates.…”

EFFECT OF SOWING DATES ON RICE (Oryza sativa L.) YIELD AND YIELD COMPONENTS OF (BHUR KAMBJA-1) VARIETY AT SOUTHERN BHUTAN

“…The farmers adopting Bhur Kambja-1 in southern Bhutan under wet-subtropical zone may consider this as optimum sowing window. However, this result may not to imply to other varieties as findings of significant interaction between sowing time and rice varieties was reported by (Fagahni et al,2011), (Safdar et al, (2013), (Khalifa et al 2014), and (Meirelles et al 2019). However, farmers with no assured irrigation may adopt Bhur Kambja-1 in times of delayed monsoon with expected yield reduction reported in this study.…”

Overcoming Competition From Intercropped Forages on Upland Rice With Optimized Nitrogen Input to Food Production in Tropical Region

“…With no N fertilizer application, rice yield was greater when monocropped than in the intercropping systems, and this difference increased as the rate of N fertilizer application increased. In the intercropping systems, forage grasses shaded rice plants due to vigorous growth of the grasses, and the consequent lower solar radiation on the rice leaves reduced plant development and photosynthetic processes during grain filling (Meirelles et al, 2019).…”