共查询到20条相似文献，搜索用时 31 毫秒
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《Biological conservation》1986,36(1):96-97
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W. O. Larbi 《Land Degradation \u0026amp; Development》2003,14(5):513-514
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《Communications in Soil Science and Plant Analysis》2012,43(10):819-834
Abstract The effect of S fertilization on S and N status and petiole NO3 ?‐N in cotton was observed during the growing seasons of 1980 and 1981. Four sites representing 2 soil subgroups were studied using a randomized complete block design with 4 replications. Leaf and petiole sampling began one week prior to bloom initiation and continued weekly for eight weeks. Leaf samples were analyzed for S and N and the petioles for NO3 ?‐N. Levels of leaf‐S varied directly with amounts of applied S. Leaf‐N and petiole NO3 ?‐N varied directly with amounts of applied N. Though not always significant, petiole NO3 ?‐N and leaf‐N showed negative correlations with leaf‐S. These results suggest that knowledge of the cotton plant S status may be necessary to interpret petiole NO3 ?‐N for N fertilization of cotton. 相似文献