Crop production factors and parametera | BRRI-LCC |
Seed and seedlings | |
Seed source | Certified seeds from BRRI |
Seed germination (%) | 92 - 95 |
Seed treatment | Seeds treated with bavistine at 3 g per kg seeds. Seeds were soaked in water mixed with bavistine for 24 h |
Seed rate (kg∙ha−1) | 30 kg seeds used to transplant 1 ha main field |
Land for seedbed preparation | Land having loamy or clay loam soils, sufficient sunlight, irrigation, and drainage facility was selected for seedbed preparation |
Seedbed preparation | ・ Decomposed cowdung at 2.0 kg∙m−2 was spread uniformly on the surface of the seedbed before or at land preparation ・ Land plowed 2 - 3 times by power tiller followed by laddering and allowed to decompose for 7 - 10 days to make the soil soft and muddy ・ When soils became sufficiently soft and muddy, 1.0-m-wide raised beds (length as long as the length of the land) were made surrounded by a 25-cm-wide and 10 - 15-cm deep canal. The soils from the canal were put on the bed. The number of beds made depended on the land size and requirement ・ Surface of the raised bed was leveled by a plane and flat wood ・ Soils at the surface of the raised bed were allowed to settle for 3 - 4 h before seed sowing |
Seed rate sown on seedbed, range (g∙m−2) | 80 - 100 |
Water management | Canals surrounding the raised beds always kept full with water to prevent soil cracking at the surface of the raised bed. Soil surface of the raised bed was not allowed to crack |
Seedling age, range (days) | 28 - 34 in Aman and 40 - 48 in Boro |
Plant population at planting | |
Hill spacing at transplanting (cm) | 20 × 20 |
Number of seedlings per hill (no.) | 3 - 4 |
P, K, S, and Zn fertilizer management | Total amounts of P as triple superphosphate, S as gypsum, Zn as zinc sulfate, and K as KCl were applied basally immediately before transplanting rice in both Boro and Aman seasons. The fertilizer rates (kg∙ha−1) were: Boro season: 17 P, 62 K, 10 S, and 2 Zn; Aman season: 12 P, 42 K, 10 S, and 2 Zn |
N fertilizer management, mean ± S.D. | The N rates (kg∙ha−1) for the LCC option given below: Aman 2009: 88 ± 14 in 3 - 4 splits; Aman 2010: 93 ± 11 in 3 - 4 splits; Aman 2011: 83 ± 12 in 3 - 4 splits; Boro 2009-10: 117 ± 14 in 3 - 4 splits; Boro 2010-11: 111 ± 17 in 3 - 4 splits; Boro 2011-12: 117 ± 14 in 3 - 4 splits |