Resumo

VILLALOBOS-GONZALEZ, Antonio et al. Water relations in corn's High Valleys of Central Bureau of Mexico in drought conditions and nitrogen fertilization. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.7, pp.1651-1665. ISSN 2007-0934.

The objective was to study the response of a group of hybrid and creoles corns in the water relations of the plant, the leaf area development, flowering, grain yield and its components under irrigation, drought and nitrogen deficiencies in a greenhouse of the Graduate College, Campus Montecillo in 2013. The treatments were: S1 unirrigated 10 d (30-40 dds); S2 unirrigated 20 d (50-70 dds); S3 unirrigated 30 d (70-100 dds), with high (AN, 160-40-20) and low N (BN, 80-40-20) applied at planting. The decrease of the soil water content (CHE) was reflected in a significant reduction (p ≤ 0.05) of the leaf water potential (ψ), osmotic (π) and turgidity (P) and relative water content (CRA) in S1, S2 and S3 with respect to irrigation AN and BN at the end drought treatments; hybrids showed higher ψ, π, P and CRA that the creoles. In all materials tested water stress reduced the expansion of leaf area (EAF), anthesis and silking was delayed (IA-FF), it decreased grain yield (RG), number of grains cob-1 (NGNM) and weight of 100 grains (P100G). In S1 and S2 hybrids showed higher EAF and produced more RG, NGNM, and had a shorter IA-FF than the creoles with AN and BN. In R and S1, with BN and S2 with AN and BN hybrids they showed higher P100G. In the S3 did not occur in grain.

Palavras-chave : corn; creoles; hybrid; water stress; yield.

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