Discussion On The Expanded Functional Sulfur Requirements Of Rapeseed Leaves And Its Use As A Diagnosis Of Sulfur Deficiency
Keywords
Functional Sulfur Requirement, Rapeseed, Leaf Expansion
Abstract
An artificial climate chamber was used to conduct a controlled flow experiment on Canola (Brassicanapus L.) at the seedling stage to explore the effects of insufficient sulfur supply on the dynamic changes of different plant growth parameters. The results showed that the change of leaf area per unit weight (i.e. A/W) is the most sensitive indicator parameter reflecting the sulfur nutritional status of plants. Based on the changes in relative yield increase rate, the functional sulfur (S) requirement for rape leaf expansion was calculated to be 0.32%. This value can more effectively reflect the sulfur abundance and deficiency status of the plant (organ) than the traditional method, that is, the critical value calculated by using the change in dry matter weight (DM) of the whole plant or a certain organ. When the supply of sulfur, which has weak reuse ability, is insufficient, the first thing to be affected is the expansion rate of young leaves, and the dry matter of the plant (or leaves) is often affected by the net assimilation rate (EA) and relative growth rate (RW). A relative increase occurs within a certain period of time after sulfur deficiency, resulting in a cumulative effect. Therefore, the expanded functional sulfur requirement of rapeseed leaves can be used as a diagnostic indicator of sulfur deficiency in rapeseed.
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Originate research is done by Wang Qingren,P.Randall DOI: 10.11674/zwyf.1997.0408, PP. 334-340
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