兰州露地红提叶和果实生长规律研究
Acta Agriculturae Shanghai(2018)
Abstract
基于兰州露地栽培红提叶和果实发育规律,实现叶和果实生长动态预测,为葡萄栽培管理调控提供重要参考.以鲜食葡萄红提为试验材料,于2016-2017年进行田间试验,分别于展叶期和坐果期后定期测量叶主脉长、果实横、纵径生长量变化,数据显示叶主脉生长呈“S”曲线,果实几何生长量随时间的动态变化呈快-慢-快-慢的双“S”型曲线,先采用Logistic模型对叶主脉和果实横、纵径生长变化拟合,然后采用三次多项式模型对果实横、纵径数据进行拟合,并对模型检验.结果表明:在年生长周期内,果实始终保持纵径大于横径的特点;用Logistic方程对叶主脉拟合效果为中等;果实横、纵径的两种模型,三次多项式对果实生长量模拟优于Logistic模型.结合果实横、纵径相对生长速率与生长变化的曲线可知,果实的第一次快速膨大期为6月初到7月中旬,第二次快速膨大期为7月下旬到8月下旬.因此,应在5月中旬及6月初做好除草、去副梢、施肥和套袋工作,以确保兰州露地栽培红提果实较好的发育.
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