桑树不可和杨树混交栽植。四周有杨树的田块,也不宜选作桑园。桑夭牛等害虫,最易为害桑树和杨树,两者栽在一块,则加重虫情发展。把桑树栽在池塘边比较好,成熟的桑果,是鱼的好饲料。洋槐不要栽在洼地,防止被水淹死。作为果园防风林带,洋槐开花会招来大量蜜蜂等虫媒,帮果树传粉,使其多结果。还可和杨树混交栽植,洋槐根上有根菌,可固氮改善土质,促进杨树生长;洋槐根浅,杨树根 Mulberry can not mix with poplar planting. Poplar plots around, it is not appropriate for mulberry. Mulberry cattle and other pests, the most vulnerable to mulberry and poplar, both planted in one, then increase the development of insects. The mulberry planted in the pond is better, mature mulberry, is a good feed for fish. Acacia not planted in the depression, to prevent being drowned. As an orchard windbreak, flowering will attract a large number of locusts bees and other insect vectors, to help fruit trees pollination to make it more results. Can also be mixed with poplar planting, root of the roots of Sophora japonica, nitrogen fixation can improve soil quality and promote the growth of poplar; Sophora root shallow, poplar root