不同小麦品种对土壤重金属镉吸收能力初探

In order to select the low accumulation wheat varieties on the soil heavy metal contaminated plots, 14 representative wheat varieties were selected for field experiments in this study. The results showed that with the increase of cadmium concentration in the soil, the cadmium content of different varieties of wheat grains was also increasing, which had a high risk of planting wheat exceeding the standard. In this experiment, 11 varieties of wheat grain cadmium exceeded the standard, and 3 varieties met the safety standard. When the soil cadmium concentration reached 6.07mg / kg, the increasing trend of cadmium content in the stalk was obvious, indicating that the wheat reduced the transfer of cadmium to the grain, which may be related to the genetic shape of the plant. The stalk transfer coefficient of Xinwheat 26 was the largest and the grain transfer coefficient of Benong 207, indicating that high cadmium stress inhibited cadmium transfer across parts of the crop.     

创新农村沼气建设新思路

一、我国农村沼气建设的现状与问题进入21世纪,国家对农村沼气建设给予了高度重视,2002年以来,农村沼气连续7年被写入以"三农"工作为主题的中央1号文件,强调发展农村沼气对促进农民增收、发展现代农业和推进新农村建设的重要作用,并且每年都要投入数以亿计的资金扶持农村沼气建设,     

如何在高水位地区建造户用沼气池

近年来，随着党中央、国务院的高度重视，农村沼气建设作为全面建设农村小康社会、改善农村生产生活条件的六小工程之一，明显加快了建设步伐。特别是小型公益项目和沼气国债项目的实施，充分发挥了示范带动作用。但另一方面，由于时间紧、任务重，项目在具体实施中不可避免地出现了一些问题。譬如，去年夏秋季雨水偏多，造成有     

新型沼气消化装置与常规消化装置对比分析研究

针对高固体含量有机废水厌氧消化处理难等问题,研制出一种新型的附着膜型厌氧消化装置,即单池多床型厌氧消化装置.运行试验表明,单池多床型厌氧消化装置与常用的升流式厌氧固体反应器(USR)相比,发酵原料和微生物的分布更加均匀、融合,运行过程中料液能实现自动搅拌,不易出现原料短路、堵塞现象,微生物滞留期(MRT)长而稳定、抗冲击,而且适宜的发酵浓度、原料利用率、池容利用率、沼气产气率等都得到了进一步提高,同时降低了建设成本,综合效益显著.