Wheat yield as influenced by weed control practices, seeding and fertilizer rates
1988
Suankamgong, A.
Grain yield was significantly influenced by the independent effects of all the factors studied. The higher yield of high seeding rate was due to greater number of spikes per square meter while fertilized plants produced significantly larger stem than the unfertilized ones. The significantly higher yield of plots where weed control was employed was due to higher number of spikes per square meter, the higher number of seeds per spike, heavier grain and longer stem. Interaction showed that fertilizer application was only effective when weeds were controlled either by handweeding alone, mulching alone, or their combination. The highest yield was attained in unmulched plots where oxadiazon and handweeding were employed and where fertilizer was applied at 180 kg N/ha at higher seeding rate of 120 kg/ha. Among the three factors studied, weed control was the most critical in terms of yield improvement. Weed species observed were grasses, broadleaves and sedges. However, the dominant weeds were grasses. Mulching in combination with handweeding or herbicide in combination with handweeding significantly reduced weed population at 3 and 6 WAE [week after emergence].
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