Influence of Soil Plowing Depth and Seeding Depth on Rice Growth in Drought Condition
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Abstract
Field rice, when faced with drought and intermittent rains, often faces problems
of growth and decreased productivity. This experiment aimed to study the influence of soil plowing depth and seeding depth on rice growth under dry conditions by planting Pathumthani 1 rice in sandy loam soil of Khok Samrong district, Lopburi province. The 6 x 2 x 3 factorial trial was planned in a completely randomized design. The drought conditions were simulated by
setting six different watering frequency intervals (W; 2, 5, 10, 20 and 25 days) together with two cultural factors: 1) two soil preparation depths (D; 25 and 40 cm) and 2) seeding depth of three levels (S; 0, 2.5 and 5.0 cm). The decision matrix method was applied to explain the results. The experimental results showed that cultural factors influenced rice growth in both drought and normal conditions, which could be described by tillering effect. The experimental results showed that cultural factors influenced rice growth both in drought and normal conditions, which could be explained by tillering, the number of filled or unfilled grains per ear, the weight of 100 seeds, good seed weight per pot, good seed per ear percentage, harvest index, water use, root dry weight, plant dry weight, and water use efficiency, which differed between the treatments (P < 0.05). When the water content was reduced, the 11th treatment (W2D2S2; 5 days, 40 cm, 2.5 cm) gave decision scores in the growth-dependent variable data like that of
the control (W1D1S1; 2 days, 25 cm, 0 cm) was the highest and the 6th treatment (W1D2S3; 2 days, 40 cm, 5 cm) gave the best score compared to other treatments. The appropriate soil preparation depth and seeding depth were 40 and 2.5 cm, respectively. Increased depth promotes growth and improves productivity when rice faces drought conditions.
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