通常情况下,优良品种比一般品种可增产10%,高的可达15～20%。优良品种的增产作用主要是通过其优质种子和与之配套的栽培技术措施实现的。在生产实践中,虽然使用了优良品种,但由于种子混杂退化严重,田间高矮三层楼,颜色五花头,生长参差不齐,管理 Under normal circumstances, better varieties than the average yield of 10%, up to 15 to 20%. The production of fine varieties is mainly through its high-quality seeds and its accompanying cultivation techniques and measures to achieve. In production practice, although the use of fine varieties, but because of the serious degradation of mixed seeds, the field three-storey height, the color of five flowers, uneven growth, management