葡萄叶片叶柄NPK含量及其季节变化的研究

STUDIES ON THE CONTENTS AND EVOLUTION OF NITROGEN,PHOSPHOROUS AND POTASSIUM IN THE GRAPE LEAVES ADN PETIOLES

对１２个葡萄品种的叶片与叶柄在５～８月中的Ｎ，Ｐ，Ｋ含量及其变化研究表明，叶片中的Ｎ含量极显著高于叶柄，叶柄中的Ｋ含量极显著高于叶片，７～８月份叶柄中的Ｐ含量极显著高于叶片。叶片中各月的Ｎ含量极显著下降，Ｐ含量５～６月和７～８月极显著上升，Ｋ含量极显著下降，叶柄中Ｎ含量极显著上升，Ｐ含量呈上升趋势，但差异不显著，Ｋ含量呈下降趋势，差异亦不显著。作者认为，８月采叶样，用叶片测Ｎ，叶柄测Ｐ，Ｋ的方法较为适宜。

The trial was carried out through the analysis of the contents of N,P and K inthe May-August’s leaves and petioles of 12 wine and table grapevine cultivars(Vitisvinifera and V. vinifera' X V.Labrusca).The foliar level of N was significantly higher thanthat in the petioles. Howeve,the K content in the petiloles was raised more than that inthe leaves,The July-August’s petioles contained significantly more P than the leaves. There were great differences among the monthly leaf contents of N,which represented adecreased evolution during the year;the May-June and July August leave’s P showed an in-creased variation;and the K was tending to decrease. For the June-August’s petioles,boththe N and P gave an increasing tendency and the K was of decreasing tendency,So that,we could suggest that the month of August be considered as the optimum period of samplingand analyzing of foliar and petiole N,P and K.