Analysis of Physical and Chemical Properties under Different Jujube Tree in Northern Shaanxi Province
Analysis of Physical and Chemical Properties under Different Jujube Tree in Northern Shaanxi Province
Information about balanced fertilization on jujube tree is limited. Thus, the objectives of our study were not only to quantify physical and chemical properties of different jujubes, but also to provide new theoretical evidence for high yield and high quality cultivation and the physiology of resistance of the jujube tree. Soil samples were collected from different types of jujube tree in Yanchuan County in North Shaanxi Province, China. There were three study areas in this county. In each area we sampled 3 sites belonging to different variety. The varieties of jujube trees were ‘Goutouzao’, ‘Muzao’, ‘Junzao’ and ‘Huitiaozao’. In each site, 0-100 cm soil layer was divided to 5 layers. It was 0-20 cm, 20-40 cm, 40-60 cm, 60-80 cm and 80-100 cm. For each site a composite sample was obtained by mixing 3 subsamples. The field moist soil samples were measured. The quantitative analysis was measured by commonly analysis of soil agriculture chemistry. The result showed that soil pH values variation tendency of soil types was basically identical with the increase of soil depth. The lowest pH value was found in 0-20 cm layer, and the highest pH value was found in 20-40 cm layer. Different jujube trees had prominent effects on soil pH values, the size of different jujube trees was as the following: ‘Muzao’> ‘Junzao’> ‘Huitiaozao’> ‘Goutouzao’. Compared different age of the same jujubes varieties, the older the jujubes was, the lower soil pH value in its soil was. The highest concentration of nitrate nitrogen was found in 0-20 cm soil layer, followed by 20-40 cm soil layer. The lowest content of nitrate nitrogen was found in 40-60 cm soil layer. Below 60 cm, the content of nitrate nitrogen showed an increasing tendency. The difference of nitrate nitrogen content was found among different soil. The order of extractable nitrate nitrogen was ‘Goutouzao’> ‘Junzao’> ‘Huitiaozao’> ‘Muzao’. The mean content of nitrate nitrogen of over age of 30 a was higher than age of 30 a below. The difference of TSN content was found among different soil. The highest concentration of TSN was found in 20-40 cm soil layer. The younger the jujube was, the higher the concentration of soil total soluble nitrogen in its 20-40 cm soil layer was. Below 40 cm layer, the concentration of TSN showed a declining trend. Compared different jujubes varieties, the order of extractable TSN was ‘Goutouzao’> ‘Huitiaozao’>‘Muzao’ > ‘Junzao’. The difference of pH value, nitrate nitrogen and TSN content were influenced by variety, fertilizer and age of jujube tree. It remained unclear the mechanism of assimilate nutriment in different jujube trees in this area.
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