论文部分内容阅读
加强对中低产田的改良培肥研究是我国发展农业的重大步骤。而中产田的施肥又存在着较大的盲目性,就河北、山东为例,这类土壤占1/3强,而它们的化肥 (NP总量)年用量均在200～250斤/亩,高者可达400～500斤。在有机肥的问题上,黄土搬家现象十分严重。因此,研究中低产田,特别是中产田的施肥限量范围,是提高化肥利用率,缓和肥料不足,改进土壤肥力状况有很大作用。根据我国实际情况,有机肥与化肥的配合施用又是这一课题的主要内容。 我们的试验安排在河北、山东11个县,供试作物主要为小麦、玉米,试验设(1)完全不施肥(CK),(2)厩肥2000斤/亩(M_2),(3)厩肥4000斤/亩(M_4),(4)厩肥2000斤/亩+尿素20斤/亩(M_2N_2),(5)厩肥2000斤
Strengthening the study of improved fertility in middle and low-yielding fields is a major step in the development of agriculture in our country. However, there is still a big blindness in the fertilization of middle-yielding fields. In Hebei and Shandong, for example, these soils account for about one third of the total, and their annual amount of fertilizers (NPs) is between 200 and 250 kg / mu. The highest up to 400 ~ 500 pounds. On the issue of organic fertilizer, loess moving is very serious. Therefore, the study of low-yielding fields, especially in middle-yielding fertilization limits range, is to improve fertilizer utilization, reduce fertilizer deficiencies, improve soil fertility conditions have a significant role. According to the actual situation in our country, with the application of organic fertilizer and chemical fertilizer is the main content of this issue. Our experiments were conducted in 11 counties in Hebei and Shandong provinces. The main crops tested were wheat and corn. The experiment was conducted with (1) no fertilizer application (CK), (2) stable manure of 2000 kg / mu (M_2), and (3) Kg / mu (M_4), (4) manure 2000 kg / mu + urea 20 kg / mu (M_2N_2), (5)