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