Crop yield response of maize (Zea mays L.) inbreds and hybrids to elevated plant density combined with deficit irrigation
Journal Title: Scientia Agriculturae - Year 2016, Vol 15, Issue 1
Abstract
The objective of this investigation was to match the functions of optimum plant density and adequate irrigation with the greatest maize genotype efficiency to produce the highest possible yields per unit area. Six maize inbred lines differing in tolerance to high density (D) [three tolerant (T); L-20, L-53, Sk-5, and three sensitive (S); L-18, L-28, Sd-7] were chosen for diallel crosses. Parents and crosses were evaluated in the 2013 and 2014 seasons under three plant densities: low (47,600), medium (71,400), and high (95,200) plants ha−1 and two irrigation regimes, i.e. water stress (at flowering stage) and non-stress (well watering). The T × T crosses were superior to the S × S and T × S crosses under the water stress–high D environment in most studied traits across seasons. The relationships between the six environments and grain yield per hectare (GYPH) showed that the two inbreds (Sk5 and Sd7) showed a quadratic regression function, with an optimum environment of well watering combined with plant density of 71,400 plants/ha. While, the rest of inbreds showed a quadratic regression very close to linear response, with an optimum environment of well watering combined with plant density of 47,600 plants/ha. The grain yield/ha across years of the 15 F1 crosses showed a quadratic regression function with an optimum environment of well watering combined with a density of 95,200 plants/ha for 5 crosses, 71,400 plants/ha for one cross and ca 83,300 plants/ha for the rest of F1's (9 crosses). Cross L20 × L53 gave the highest grain yield in this study under well watering combined with high-D (17.05 t ha−1) and with medium-D (16.45 t ha−1).
Authors and Affiliations
A. M. M Al-Naggar, M. M. M Atta, M. A Ahmed, A. S. M Younis
Keywords
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- EP ID EP117964
- DOI 10.15192/PSCP.SA.2016.15.1.314328
- Views 154
- Downloads 0
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