关键词: 秸秆；牛粪；好氧堆肥

Abstract:

Large scale farming has become the development trend for modern animal husbandry. Recently large scale dairy cow breeding has undergone unprecedented development in Xinjiang Uygur Autonomous Region, but the fecal utilization became a prominent issue. Using cow dung as the main raw material, and adding biological maturity agent and 4 different straws as additives, this study explored the impact of different straw sources addition on cow dung aerobic composition. Results showed as follows: ① At the end of composting, except the control in all treatments the water contents were ≤20%, and met the moisture content standard in organic manure composting. Moisture content of cow dung mixed with alfalfa straw reached standard level at the 18 d section. ② The pH increased and then decreased for all treatment, and the ending heap materials showed a weak alkaline, with pH values at 8.0~9.0. These pH values meet the standard of organic manure composting.  Cow dung and cotton straw composting process ended with a conductivity of 3.28 ms/cm, and would not hinder the crop growth. ③ Throughout the whole composting process, when comparing the contents at initial stage with the end states, it was found that TN contents increased for all treatments except cow dung mixed with alfalfa straw treatment and the control treatment, while TP contents for all treatments increased other than cow dung mixed with cotton straw treatment and the control treatment. Moreover, for each treatment, TK content increased when comparing with the initial state. At the end of the composting, the AP and AK contents increased in each treatment, while the organic matter content reduced, because of mineralization and release of nutrients. But the organic matter content still met the organic matter standard for organic fertilizer.

Key words: straw, cow dung, aerobic composting