山地幼树粟园放闷炮扩穴技术答山东省莱西市读者林培丛山地栗园往往因底层土石坚硬，而难以深翻扩穴，采用放闷炮扩穴效果很好。方法是距树干２ｍ左右处挖炮眼，按三角形布眼，即上角炮眼２个，下角炮眼１个，炮眼的入地角７０°为宜，一般深８００ｃｍ．上口径８ｃｍ，下... Mountain Sapling Supanang gunpowder expansion hole technology A, Laixi City, Shandong Province, readers Lin Pei Cong mountain chestnut garden is often hard because of the underlying hard rock, and difficult to deep poking expansion hole, the use of the muffling gun hole effect is very good. The method is to dig a hole at a distance of about 2m from the trunk and arrange the triangle according to the triangle, that is, two upper-hole bores, one lower-angle bores, and the lower bores 70 °, which are generally 800cm deep. On the caliber 8cm, under ...