利(li)用作物(wu)間互相(xiang)輔助與克(ke)制(zhi)的(de)作用，可以(yi)達到減(jian)少農(nong)藥(yao)用量的(de)目的(de)。例如，果(guo)園(yuan)使(shi)用農(nong)藥(yao)過多，果(guo)樹(shu)開花期蜜蜂和蝴蝶(die)數目減(jian)少，可以(yi)在果(guo)園(yuan)中種一(yi)些向日葵，因為它的(de)花蜜會吸引(yin)蜜蜂和蝴蝶(die)飛來(lai)，從而促進果(guo)樹(shu)授粉、結果(guo)實。也可以(yi)在果(guo)園(yuan)的(de)梨樹(shu)和蘋果(guo)樹(shu)旁種金蓮(lian)(lian)花，果(guo)樹(shu)根(gen)系吸收金蓮(lian)(lian)花根(gen)部所(suo)分泌出的(de)汁液，病蟲也會減(jian)少。

　　栽種青椒時，順便種些大蒜，不但能提高青椒的品質，也能提高產量；種黃瓜及其它(ta)(ta)藤類作物(wu)時，在旁邊種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)上幾棵(ke)(ke)白蘿(luo)卜；種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)葉菜類作物(wu)時再種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)幾棵(ke)(ke)薄荷；種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)大(da)(da)蒜時間種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)幾棵(ke)(ke)洋(yang)蔥(cong)，病(bing)蟲就可(ke)以減少發生(sheng)。如果單(dan)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)紅(hong)蘿(luo)卜，病(bing)蟲發生(sheng)比較多，間隔地(di)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)些(xie)(xie)茴香，害(hai)蟲就不會侵入。但茴香開花后，會抑制紅(hong)蘿(luo)卜生(sheng)長，因(yin)此在茴香開花前就要拔除它(ta)(ta)。種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)同一(yi)(yi)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)蔬菜病(bing)蟲發生(sheng)的比率較高，如果在菜園內隔一(yi)(yi)段距離(li)種(zhong)(zhong)(zhong)(zhong)(zhong)(zhong)些(xie)(xie)刺(ci)激性作物(wu)，比如大(da)(da)蒜、蔥(cong)、辣椒等，可(ke)以明顯地(di)減少病(bing)蟲害(hai)發生(sheng)。