Long-term yield patterns for continuous winter wheat cropping in northern Greece
Long-term yield patterns for continuous winter wheat cropping in northern Greece
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DOI：
10.1016/j.eja.2006.05.003
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发表时间：
2006-10-01
影响因子：
5.2
通讯作者：
Gagianas, A. A.
中科院分区：
文献类型：
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作者：
Lithourgidis, A. S.;Damalas, C. A.;Gagianas, A. A.
连作冬小麦（Triticum aestivum L.）种植是希腊许多种植者的常见做法，特别是在肥力较低的土壤或其他作物无法盈利的非灌溉田地中。在希腊北方的四种土壤上，研究了连续25年在相同的传统耕作措施下种植的小麦对产量的影响。无论土壤类型如何，粮食产量每年都有很大差异，显示出很高的时间变异性。与粘壤土和桑迪粘壤土相比，桑迪壤土和粘壤土的谷物产量多年来最不稳定，表现出较低的时间变异性。桑迪的籽粒产量与3 ~ 5月的降雨量呈高度相关（r = 0.71），而粘壤土的籽粒产量与生长季的总降雨量呈高度相关（r = 0.89）。粘壤土和桑迪粘壤土的籽粒产量对降雨的依赖性小于其他两种土壤。平均而言，桑迪壤土和粘壤土的谷物产量（分别为1.94和2.46 Mg ha（-1））比粘壤土和桑迪粘壤土（分别为3.48和3.72 Mg ha（-1））低得多，表明小麦产量依赖于土壤类型。尽管粮食产量的时间变异性很大，没有显着的趋势，对产量下降的任何土壤研究。土壤pH值和有机质含量在试验中后期差异不显著。在保持常年施肥和有效控制杂草的前提下，小麦连续种植多年，产量不会明显下降，土壤pH值和有机质含量也不会发生明显变化。(c)2006 Elsevier B. V.保留所有权利。
Continuous winter wheat (Triticum aestivum L.) cropping is a common practice for many growers in Greece, particularly in soils with low fertility or non-irrigated fields where other crops cannot grow profitably. The effect of continuous cropping on grain yields of wheat grown under the same conventional tillage practices for 25 years was studied in four soils of northern Greece. Grain yields varied considerably from year to year, regardless of soil type, showing a high temporal variability. Grain yields from the sandy loam and the clay soil were the most unstable across years compared with those from the clay loam and the sandy clay loam soil, which showed lower variability in time. Grain yields from the sandy loam soil showed a high correlation with rainfall during March to May (r = 0.71), whereas grain yields from the clay soil showed a high correlation with total rainfall during growing season (r = 0.89). Grain yields of the clay loam and the sandy clay loam soil appeared to depend on rainfall less than yields of the other two soils. On the average, grain yield was much lower in the sandy loam and the clay soil (1.94 and 2.46 Mg ha(-1), respectively) than in the clay loam and the sandy clay loam soil (3.48 and 3.72 Mg ha(-1), respectively) showing a dependence of wheat yield on soil type. Despite the high temporal variability of grain yields, no significant trends towards yield decline were observed for any of the soils studied. In addition, no significant differences were detected in soil pH values and organic matter content at the middle or at the end of the experiment. Given that annual fertilization is maintained and weeds are controlled effectively, it could be concluded that continuous wheat cropping may be practiced for many years without significant yield decline or significant change in soil pH and organic matter content. (c) 2006 Elsevier B.V. All rights reserved.