Sustainable Water and Environmental Management in Monsoon Asia
30-31 October 2014, Kaohsiung, Taiwan
a b
Fig.1 Experimental fields: a Greenhouse of Meiji University, b Paddy field in Bali
In the pot experiment, six pots were used with a Japonica rice variety
Koshihikari
. The diameter of the pot was 25 cm and the height was 30 cm. For the paddy experiment, three
plots were used with different rice cultivation, i.e., conventional and SRI with the same rice cultivar,
Sintanur
. The elements of conventional rice farming were 21 days of seedling time, spacing at 20 x 20 cm
2
, and using three seeds per hill. For the SRI, the elements were 6 days of seedling time, spacing 30 x 30 cm
2
, and using single seed per hill.
2.2 Water Management
For the pot experiment, the water level was kept at the soil surface until 20 days after transplanting. Then, the regime was divided into three regimes, i.e., wet, medium, and dry
regimes. The water level was kept at 0 cm, -5 cm and -10 cm from the soil surface for the wet, medium and dry regimes, respectively.
Sustainable Water and Environmental Management in Monsoon Asia
30-31 October 2014, Kaohsiung, Taiwan
Fig.2 Water management regime: a the pot experiment, b the paddy field experiment
Meanwhile, for the experiment in the paddy field, the three plots were supplied with different regimes. The first plot was continuous flooding regime CF regime for conventional rice
farming. The ground water level was kept at 2 and 5 cm water depth above the soil surface from the beginning cultivation period to one week before harvesting, and then the water was
drained until harvesting time. For the second plot was wet irrigation regime WET regime for SRI in which the soil moisture was kept at saturated level or at 0 cm water depth from the
beginning to one week before harvesting, and then the water was drained until harvesting time. The last plot was dry irrigation regime for SRI DRY regime in which the ground
water level was kept at 0 cm water depth from the beginning to 60 days after transplanting, then the water was drained at -5 cm water depth until one week before harvesting time, and
finally the water was drained until harvesting time.
2.3 Field Measurement
