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有机质是土壤肥沃度的重要标志,对改善土壤理化性状和提高农作物产量有重大意义。本文就延安地区土壤有机质现状及其提高的主要途径作初步探讨。一、土壤有机质现状根据土壤分析资料,我区土壤有机质含量和分布有以下特点:1.大部分农耕地有机质含量低下。据延安、黄陵、子长等7县(市)近5000个土样分析,有机质的平均含量为0.5—0.9％,很少超过1％。黄陵县378个土样有机质平均值0.9403％,洛川县1255个土样有机质平均值0.8691％,延安市1196个土样有机质平均值0.7138％,
Organic matter is an important indicator of soil fertility, to improve soil physical and chemical properties and improve crop yield is of great significance. In this paper, the current status of soil organic matter in Yan’an and the main ways to improve it are discussed. First, the status of soil organic matter According to soil analysis data, the content and distribution of soil organic matter in our area has the following characteristics: 1. The majority of agricultural land with low organic matter content. According to nearly 5000 soil samples from 7 counties (cities) in Yan’an, Huangling and Zizhang, the average content of organic matter is 0.5-0.9%, rarely exceeds 1%. The average organic matter content of 378 soil samples was 0.9403% in Huangling County, 0.8691% in 1255 soil samples in Luochuan County, 0.7138% in 1196 soil samples in Yan’an City,