Abstract
This study aimed to evaluate the effect of row spacing and nitrogen topdressing fertilization of two materials (genotype 07SEQCL441 CL and cultivar BRS Esmeralda) on the plant height, yield components, grain yield, and quality of an upland rice crop grown in a no-tillage system. Trials were conducted for two growing seasons under field conditions in a 3 x 4 factorial, randomized, complete block design, with four replications. For each material, treatments consisted of the combination of row spacing (0.225, 0.35, and 0.45 m) with nitrogen (N) applied as topdressing (0, 50, 100, and 150 kg ha-1). The lowest row spacing (0.225 m) for genotypes 07SEQCL441 CL and BRS Esmeralda provided a higher number of tillers, number of panicles m-2, and grain yield of rice. Increasing rates of N in the topdressing improved the rice grain yield for both cultivars, but for 07SEQCL441 CL, the grain yield was positively affected only to applications up to 50 kg N ha-1. Row spacing and N rates did not affect the rice grain quality. Therefore, these results indicate that the narrowest row spacing used (0.225 m) with N fertilization as topdressing increased the rice grain yield most in the no-tillage system.
Highlights
The majority of rice cultivated in the world is under flooded conditions (Prasad, 2011)
The objective of this study was to determine the effect of row spacing and nitrogen topdressing fertilization on the plant height, yield components and grain yield, and quality of two new genotypes of upland rice cultivated under no-tillage systems
The row spacing significantly affected the number of tillers, number of panicles, and grain yield of the genotype 07SEQCL441 (Table 2) and the number of tillers, plant height, number of panicles, and grain yield for the genotype BRS Esmeralda (Table 3)
Summary
The majority of rice cultivated in the world is under flooded conditions (Prasad, 2011). Upland rice is cultivated in Asia, Africa, and the Americas (Nascente, Crusciol, & Cobucci, 2013). As water availability for rice irrigation by flooding decreases, mainly in China and India, upland rice cultivation is increasing in importance (Feng et al, 2007; Prasad, 2011). The development of technologies that conserve water, such as growing rice under aerobic conditions in a no-tillage system (NTS) instead of flooding (Nascente et al, 2013), would augment and stabilize upland rice yields in addition to consuming less water (Crusciol, Soratto, & Mateus, 2006; Heinemann, Stone, & Fageria, 2011)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
