2006-Long-term yield patterns for continuous winter wheat cropping in northern Greece.pdf

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2006-Long-term yield patterns for continuous winter wheat cropping in northern Greece.pdf

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2006-Long-term yield patterns for continuous winter wheat cropping in northern Greece

Af t r c s t y t t s f y ? K 1 g a u a a i i w c c t 1 dEurop. J. Agronomy 25 (2006) 208–214 Long-term yield patterns for continuous winter wheat cropping in northern Greece A.S. Lithourgidis a,?, C.A. Damalas b, A.A. Gagianas b a Department of Agronomy, Aristotle University Farm of Thessaloniki, 570 01 Thermi, Greece b Laboratory of Agronomy, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece Received 6 September 2005; received in revised form 12 May 2006; accepted 17 May 2006 bstract Continuous winter wheat (Triticum aestivum L.) cropping is a common practice for many growers in Greece, particularly in soils with low ertility or non-irrigated fields where other crops cannot grow profitably. The effect of continuous cropping on grain yields of wheat grown under he same conventional tillage practices for 25 years was studied in four soils of northern Greece. Grain yields varied considerably from year to year, egardless of soil type, showing a high temporal variability. Grain yields from the sandy loam and the clay soil were the most unstable across years ompared with those from the clay loam and the sandy clay loam soil, which showed lower variability in time. Grain yields from the sandy loam oil 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 otal 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 ields 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) han 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 he high temporal variability of grain yields, no significant trends towards yield decline were observed for any of the soils studied. In addition, no ignificant differences were detected