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Assessment of the critical period for weed competition in two varieties of barley (Hordeum vulgare) with two sowing dates

, : Assessment of the critical period for weed competition in two varieties of barley (Hordeum vulgare) with two sowing dates. Circular Tecnica, Departamento de Parasitologia, Universidad Autonoma de Chapingo (9): 1

Barley cvs. Apizaco and Centinela was sown on 22 May and 14 July 1980 under rainfed conditions. In the first crop Brassica campestris was the dominant weed and Apizaco was the more competitive variety, requiring a weed-free period of 50 to 60 days after emergence. Both varieties were more competitive at the later sowing time, requiring a weed-free period of 45 days after emergence.


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