Optimizing Seed Rate to Suppress Weeds and to Increase Yield in Aerobic Direct-seeded Rice in Northwestern Indo-Gangetic Plains

Mahajan, Gulshan; Gill, M. S.; Singh, Kulvir

doi:10.1080/1522886x.2010.496109

Cited by 31 publications

(23 citation statements)

References 13 publications

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“…Similar results were also observed by many researchers (Phuong et al 2005;Anwar et al 2011). Mahajan et al (2010) opined that closer spacing can keep the weed flora under check through smothering effect. Guillermo et al (2009), on the other hand, revealed that higher plant densities might have a competitive advantage over weeds due to fast canopy development resulted in reduced weed growth.…”

Section: Weed Density and Dry Weightsupporting

confidence: 78%

Weeding regime and plant spacing influence on weed growth and performance of transplant aman rice variety Binadhan- 7

Khan¹,

Hasan²,

Anwar³

et al. 2017

Fundam Appl Agric

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Plant spacing and weeding regime are amongst the key factors determining rice growth and yield through maximum utilization of space, plant nutrients, water and sunlight. Therefore, it is essential to identify optimum spacing and proper weeding regime for ensuring the potential yield of a rice cultivar. A field experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh during July-December 2012 to study the influence of spacing and weeding regime on the performance of transplant aman rice cv. Binadhan-7. The experiment comprised four plant spacings viz. 25 cm × 15 cm, 20 cm × 15 cm, 15 cm × 15 cm and 15 cm × 10 cm, and five weeding regimes viz. no weeding, one weeding at 15 days after transplanting (DAT), two weeding at 15 and 30 DAT, three weeding at 15, 30 and 45 DAT and weed free. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The highest weed density and dry weight were recorded with the spacing of 20 cm × 15 cm and 25 cm × 15 cm, respectively. But the lowest values were observed in the closest spacing of 15 cm × 10 cm. Plant spacing exerted significant influence on most of the plant characters except plant height and 1000-grain weight. The highest and statistically significant grain yield was obtained from 20 cm × 15 cm spacing (6.05 t ha -1 ) and 25 cm × 15 cm spacing (6.04 t ha -1 ) because of highest number of filled grains panicle -1 (143.65) and highest number of effective tillers hill -1 (10.13). Weeding regime also had significant effect on all the parameters except 1000-grain weight. The highest grain yield (6.29 t ha -1 ) was obtained from the weed free condition which produced 37.33% higher yield than unweeded condition (4.58 t ha -1 ). Interaction between plant spacing and weeding regime significantly influenced all the parameters studied except 1000-grain weight. The highest grain yield (6.71 t ha -1 ) was obtained from the interaction between 20 cm x 15 cm spacing and three weeding regimes at 15, 30, 45 DAT which was similar to the treatment combination of 15 cm × 15 cm spacing and weed free condition. But maintaining season long weed free condition is not practical from economic view point, therefore Binadhan7 should be transplanted at 20 cm × 15 cm spacing following three times weeding at 15, 30 and 45 DAT for higher yield and effective weed control.

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Section: Weed Density and Dry Weightsupporting

confidence: 78%

Weeding regime and plant spacing influence on weed growth and performance of transplant aman rice variety Binadhan- 7

Khan¹,

Hasan²,

Anwar³

et al. 2017

Fundam Appl Agric

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“…The choices of genotypes and seeding rates are crucial yield determinants in DSR. Seed rates in DSR influence crop growth and grain yield (Mahajan et al, 2010). The genetic potential of genotypes can be used by selecting an optimum seed rate.…”

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confidence: 99%

Performance of Dry Direct‐Seeded Rice in Response to Genotype and Seeding Rate

Mahajan

Chauhan

2016

Agronomy Journal

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Dry direct-seeded rice (Oryza sativa L.) (DSR) is an emerging production system in South Asia. Limited research has been done in DSR for optimizing seeding rate to achieve a high yield in South Asia, especially for hybrids. In this study, we investigated yield formation, dry matter, and N translocation of four rice genotypes (two hybrids: 'PAC-837' and 'SVH-127'; two inbreds: 'PR-115' and 'PR-121') in response to varying seeding rates (80, 120, 160, and 200 seeds m -2 ). Th e grain yield of the hybrids was higher (6.84-8.52 Mg ha -1 ) than that of inbreds (5.41-6.70 Mg ha -1 ) at each seeding rate; however, the magnitude of the increases in yield was higher at the lowest seeding rate (80 seeds m -2 ). Th e highest grain yield was achieved with PAC-837 (8.52 Mg ha -1 ) at 80 seeds m -2 . Th is was caused by a substantial increase in N uptake (111.6 kg ha -1 ) and total N uptake (173.2 kg ha -1 ) for PAC-837 at the lowest seeding rate (80 seeds m -2 ). Translocation of dry matter (3.70 and 3.37 Mg ha -1 for PAC-837 and SVH-127, respectively) and N accumulation (51.0 and 50.0 kg ha -1 for PAC-837 and SVH-127, respectively) was higher in the hybrids than in inbreds. Th e results indicated that in DSR, both the hybrids and inbreds showed the highest grain yield at the lowest seeding rate (80 seeds m -2 ). Th is study suggested that the grain yield of DSR at 200 seeds m -2 decreased because of lower N translocation and postanthesis N accumulation compared to 80 seeds m -2 .

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“…In countries such as Vietnam, 150-200-kg ha −1 seeding rates are being used, while in northwest India, farmers use a rate of 15-25 kg ha −1 [48]. Farmers use high seeding rates to compensate for poor quality seeds and to cover the risk of rodent, bird, insect, and nematode attacks [12].…”

Section: Tillage Systems and Land Preparationmentioning

confidence: 99%