我县从1979年试种芦笋,1988年扩至3800亩,由于沿用传统栽培方法,投产迟,产量低,效益极差。1989年全县刮起一股“挖笋风”,仅留存25％。针对这一情况,我们认真总结了低产的原因,积极进行科学试验,探索出“五改”技术经验。在近几年的实施推广中收效显著,农民种植芦笋的积极性空前高潮,1992年秋栽植面积发展到近1万亩,现将“五改”技术介绍于后: 一、改笋苗稀育为合理密育 (一)合理密育依据:过去稀育,管理难度大,既浪费土地,又浪费人力,相反笋苗育不好。经改大苗移栽为小苗移栽后,因苗小,苗期短,覆盖面小,随之也改稀育为合理密育。 (二)合理密育的特点:①在稀育的基础上节约耕地50％,以500公斤种籽计可降低消耗4.3万元。②苗床集中覆盖薄膜、草帘方便,保温保湿良好,一是有利于提前育苗,提前出圃,提早移栽。二是出苗率 Asparagus was planted in our county from 1979 and expanded to 3800 mu in 1988. Due to the traditional cultivation methods, it has been put into operation late, the output is low, and the benefit is very poor. In 1989 the county blew a “digging bamboo shoots wind”, leaving only 25%. In view of this situation, we conscientiously summed up the reasons for the low yield, actively carry out scientific experiments, to explore “five changes” technical experience. In recent years, the implementation of the promotion of significant results, the enthusiasm of farmers planting asparagus unprecedented climax, autumn planting area in 1992 to nearly 1 million mu, now the “five changes” technology introduced in the future: First, change bamboo shoots and thinning is reasonable Dense (a) reasonably dense basis: the past thinning, management is difficult, not only waste land, but also a waste of manpower, on the contrary shoot nursery poor. After transplanting the seedlings for transplanting seedlings transplanting, due to seedlings, seedling short, coverage is small, along with change to thinning is reasonably close. (II) Reasonable and dense characteristics: (1) 50% of arable land is saved on the basis of thinning and the consumption of 43,000 yuan can be reduced by 500 kilograms of seeds. ② seedbed concentrated cover film, straw curtain convenient, good thermal insulation, one is conducive to early nursery, early nursery, early transplanting. Second, the emergence rate