Rice Production Under Different Water Input
“More crops per drop” concept is a growing interest in rice cultivation. An experiment was carried out to determine the effect of reducing water on rice production and to investigate the temporal changes in chemical properties in soil solution. There were five treatments simulating different floo...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2004
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/306/1/549540_T_FP_2004_45.pdf |
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| Summary: | “More crops per drop” concept is a growing interest in rice cultivation. An
experiment was carried out to determine the effect of reducing water on rice
production and to investigate the temporal changes in chemical properties in
soil solution. There were five treatments simulating different flooding depths
and durations during the rice growing period namely, W1: continuous flooding
at 5cm, W2: continuous flooding at 1cm, W3: continuous flooding at 5 cm
for the first 3 weeks followed by 1cm thereafter, W4: continuous flooding at 5
cm for the first 6 weeks followed by 1cm thereafter, and W5: continuous
flooding at 5cm for the first 9 weeks followed by 1cm thereafter. Soil pH and
redox potential were taken at 4cm depth, and the concentrations of N, P, K,
Ca, Mg, Zn, Cu, Fe, and Mn in soil solution were measured at weekly
intervals. At harvest, the number of tillers and panicles were counted. Grain
yield, number of grains per panicle and weight of 1000 seeds were
determined. In addition, the weight of straw was also obtained. The effect of
irrigation treatments was not significant for tiller number, panicle number,
grain yield (t/ha), straw weight (t/ha), grain/panicle, and 1000 seeds weight
(g).The tiller numbers and panicle numbers were in the range of 6745000 to 6956000, and 6367000 to 6651000 per ha, respectively. Grain yield of rice
under continuous 5cm flooding was not significantly different from the other
treatments. Dry filled grain yield (12% moisture content) was found to range
from 11.72 to 12.39 t/ha. The weight of 1000 seeds was 27.2 to 27.8g. The
different flooding levels had no significant effect on the nutrients
concentration analyzed in soil solution at weekly intervals. However, in
general, there was an increase in the concentrations of N, Zn, Cu, Fe, and
Mn in the soil solution during the first few weeks of flooding, then the values
remained relatively stable until harvest, while P concentration remained
constant through out the growing period in all treatments. The concentration
of K, Ca, and Mg declined with time for all treatments. Redox potential value
was significantly lower in treatments that were under 5cm flooding water
compared to 1 cm flooding water, and it showed values that were more
negative. Soil pH was in the range of 5.4 to 6.6 in all treatments. Overall, this
study showed that yield and yield components, nutrient concentration, and
soil pH were not affected by different water treatments but redox potential
was significantly different.
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