Abstract
In a study of the effect of plant density and plant geometry on grain yield of rice grown under various levels of soil nitrogen and environmental regimes, the grain yield of IR36 (early maturing) and IR26 (intermediate maturing) rices grown during the 1976 wet season and the 1977 dry season in the Philippines increased by 0.6 t ha −1 as the plant density increased from 2.2 × 10 5 to 5.0 × 10 5 hills ha −1 . The yield of two early maturing rices — IR36 and IR40 — grown during the 1977 wet season increased by 1.3 t ha −1 when the plant density increased from 0.67 × 10 5 to 10 6 hills ha −1 . The rate of fertilizer application affected rice yield response to plant density with no fertilizer nitrogen applied or with low levels ( ⪕ 60 kg N ha −1 ) of applied fertilizer nitrogen. Grain yield increased either linearly or curvilinearly with increased plant density. At a high level of applied nitrogen (120 kg N ha −1 , grain yield increased as the plant density was increased to a certain level beyond which the yield decreased with increased plant density. Plant geometry significantly affected the grain yield of rice. In the 1976 wet season, when the solar radiation was low and sunshine duration was short during the reproductive and ripening stages of rices, the yield of rice planted in a short-rectangular (20 cm × 10 cm) spacing pattern was significantly higher than that of rice planted in a long-rectangular (40 cm × 5 cm) spacing. During the 1977 dry season, however, with high solar radiation and long sunshine duration, the trend was reversed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.