长期不同施肥对玉米田间杂草种群组成的影响

通过田间小区试验,研究了长期不同施肥对玉米田间杂草种群组成的影响。结果表明:N、P、K平衡施用时,无论是施用有机肥,或是施用无机化肥,田间杂草的种群组成相似;不施用 P 肥能显著引起杂草种群组成的改变;不施用 N 肥也有一定的影响,但不施用 K 肥却无显著影响。主成分分析表明:土壤速效 P 是影响田间杂草种群组成最为重要的因子,而速效 N 则为第二重要因子。

EFFECT OF LONG-TERM FERTILIZATIONS ON COMPOSITION OF WEED COMMUNITIES IN MAIZE FIELD

Plot trials were carried out to study effects of different patterns of long-term fertilization on composition of weed communities in maize field. The results show that no significant difference was observed in composition of weed communities between plots receiving balanced NPK fertilization of organic manure or chemical fertilizer. In plots without P application changes in composition of weed communities were obvious and so was the case in plots without N application, though not so obvious as it was with the former. In plots without K application, however, composition of the weed communities remained almost unchanged. PCA analysis indicated that soil available P was the most important factor affecting composition of weed communities, and followed by soil available N.