求翻译：本文报道的研究中，调查了用不同施氮量栽植的马铃薯6个对比品种叶长面积的相关性，以确定在多种农艺措施条件下能否利用叶长作为叶面积的预测值。是什么意思？

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This article reported in the research, investigated the potato 6 contrast variety leaf long area relevance which transplants with different Shi Danliang, by determined whether takes the leaf area under many kinds of agronomy measure condition using Ye Chang the forecast value.

Studies reported in this article, surveys with different amount of nitrogen was planting of 6 contrasting varieties of potato leaf long area correlation, to determine whether several agronomic measures under the conditions of use of leaf as the leaf area predictive value.