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Are Wheat Hybrids More Affected by Weed Competition than Conventional Cultivars?
Agronomy ( IF 3.949 ) Pub Date : 2020-04-07 , DOI: 10.3390/agronomy10040526
Marco Milan , Silvia Fogliatto , Massimo Blandino , Francesco Vidotto

Seeding rates of hybrid wheat varieties are typically much lower than conventional varieties due to their higher seed costs, which could potentially delay canopy development leading to greater weed pressures. To test whether hybrid wheat crops are more affected by weed pressure than conventional cultivars, a conventional variety (“Illico”) and a hybrid (“Hystar”), were compared in a three-year (2012–2016) field study at two sites in Northern Italy. Weed infestation was mainly characterized by weeds with an early growth pattern, and in only a few seasons did the hybrid crops show a higher weed density than the conventional cultivar. Despite the lower sowing rate, hybrids were able to achieve a similar crop density to the conventional cultivar even in years of delayed sowing or dry weather conditions. Normalized Difference Vegetation Index values were generally similar between cultivars across the years, regardless of the presence of weeds, except during the springtime. Occasionally, the test weight was significantly higher in weeded plots than un-weeded plots. Overall, the two cultivars showed similar yields within the same year. These results indicate that on fields with a low weed burden, and where these weeds emerge early, cultivars may not be significantly affected by productivity losses.

中文翻译:

与常规品种相比,杂草竞争对小麦杂种的影响更大吗?

杂种小麦品种的播种率通常比常规品种低得多,原因是它们的种子成本较高,这可能会延迟冠层发育,导致更大的杂草压力。为了测试杂种压力对杂种小麦作物的影响是否大于常规品种,我们在两个地点进行了为期三年(2012-2016年)的田间研究,对常规品种(“ Illico”)和杂种(“ Hystar”)进行了比较。在意大利北部。杂草侵染的主要特征是杂草具有较早的生长模式,并且仅在几个季节中杂种作物的杂草密度就比常规品种高。尽管播种率较低,但即使在延迟播种或干旱天气多年的情况下,杂种也能够获得与常规品种相似的作物密度。多年以来,无论杂草的存在与否,除春季以外,标准化的不同植被指数值通常相似。有时,杂草样地的试验重量明显高于非杂草样地。总体而言,两个品种在同一年内表现出相似的产量。这些结果表明,在杂草负荷低的领域,以及这些杂草生长较早的地方,栽培品种可能不会受到生产力损失的明显影响。
更新日期:2020-04-07
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