Research studies performed in Danish wheat fields(ทุ่งนา), together with recent studies in Colombian cornfields(ไร่ข้าวโพด), demonstrate that modified sowing(การหว่าน) patterns and the nearer spacing of crops results(ผล) in a reduction(การลดลง) of total weed biomass(มวลชีวภาพ). The amount(จำนวนรวม) of weeds was heavily reduced -- by up to 72% -- while grain yields increased by more than 45% in heavily weed-infested fields. The trick is to increase crop-weed competition and utilize the crop's head start(เริ่ม), so that it gains a large competitive advantage over the neighbouring weeds(วัชพืช).