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一百多年前,伟大的生物学家达尔文曾经说过:“蚯蚓是地球上最有价值的动物。”它有改良土壤的本领,是农家的好帮手。据科学家统计,如果每亩地里有五万条蚯蚓,每年排泄的蚓粪约有18吨之多。蚓粪含丰富的氮、磷、钾、镁等元素,是一种高效的颗粒肥料,能提高土壤肥力,改善土壤结构。蚯蚓怎样在土壤中不断纵横穿孔、上下翻动土壤呢?要了解这个秘密,我们可以做个简单的观察实验: 先采集蚯蚓。可在菜园或是农田里肥沃的土壤上浇些稀氨水、盐水或烟草水,蚯蚓就会从土中爬出。蚯蚓怕水,因此,雨后在露出水面的地上翻土,也可采集到蚯蚓。蚯蚓采到后,用水洗净,挑选粗壮无伤的放在洁净的马粪纸上,你可用手指在蚯蚓身上轻轻地来回抚摸,就会感觉到蚯蚓身上有
One hundred years ago, the great biologist Darwin once said: “Earthworms are the most valuable animals on earth.” It has the ability to improve the soil and is a good helper for farmers. According to the statistics of scientists, if there are 50,000 earthworms per mu, there are about 18 tons of vermicompost excreted each year. Earthworm excrement is rich in nitrogen, phosphorus, potassium, magnesium and other elements, is a highly efficient granular fertilizer, can improve soil fertility and improve soil structure. Earthworms how to constantly vertical and horizontal perforation in the soil, flip the soil up and down? To understand this secret, we can do a simple observation experiment: first earthworms collected. Earthworms can crawl out of the earth by drenching dilute ammonia, salt water or tobacco water on fertile soils in the vegetable garden or farmland. Earthworms fear water, therefore, after the rain on the ground exposed soil, can also be collected earthworms. After earthworm is taken, wash it with water and pick it thick and harmless on a clean horse manure paper. You can gently touch the earthworm with your fingers and feel the earthworms