Grain Yield Comparison of Pure Stands and Equal Proportion Mixtures for Seven Hybrids of Maize

Hoekstra, G. J.; Kannenberg, L. W.; Christie, B. R.

doi:10.4141/cjps85-068

Cited by 24 publications

(21 citation statements)

References 25 publications

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“…However, there are studies which suggest beneficial effects of varieties mixing for many crops. Studies done by Hoekstra et al (1985a) and Midmore and Alcazar (1991) showed that varietal mixture in maize gave higher yield than their pure stands. In mixed cultivar cultures, each cultivar tends to express their competitive ability, which may result in high yields (Hoekstra et al 1985b).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Hybrid and OPV Maize Varieties for Grain Yield and Agronomic Attributes under Farmer's Field Conditions at Dukuchhap

Paudel

2014

Nepal Agric. Res. J.

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Field experiments were conducted during two consecutive years 2006 and 2007 in full season of maize (May-Sep) at Dukuchhap, Lalitpur to find out impact of growing hybrid and OPV maize in different rows combinations with respect to their pure stands in same environment of growing and to sort out non-lodging maize varieties. The experiments consisted of an open pollinated variety (OPV) 'Deuti' and hybrid 'Gaurab' in different row combinations (50% hybrid + 50% OPV, 75% hybrid + 25% OPV, 75% OPV + 25% hybrid plus their pure stands). The results showed that Gaurab (yellow, flint type) and Deuti (white, semi-flint type, selected from CIMMYT's material ZM 621) did not vary significantly in grain yield and yield components. There was no effect of mixed row culture between the OPV and hybrid for grain yield and yield attributes. A bivariate correlation coefficient between agronomic traits and ear traits indicated that there was a positive relation among these traits. However, a positive and highly significant (r = 0.766**) relationship between ear fill and ear length was observed while a very weak relation (r = 0.096*) between grain weight/ear and ear height was also noticed suggesting taller the ear height lower the grain yield/ear and vice versa. The findings of the study support that plant height and ear height were weakly related with other ear traits; nevertheless, these were highly related to grain weight/per plant. To cope with stalk lodging problem and to attain higher grain yield these varieties are equally potential and recommended to grow under Dukuchhap conditions.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Hybrid and OPV Maize Varieties for Grain Yield and Agronomic Attributes under Farmer's Field Conditions at Dukuchhap

Paudel

2014

Nepal Agric. Res. J.

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“…On the other hand, the reaction of the populations' yield to increasing heterogeneity is not as clear. In many experiments, blends of genotypes outyielded the mean of their components grown in pure stands, but in other studies such superiority was not observed (SIMMONDS 1962, KANNENBERG and HUNTER 1972, TRENBATH 1974, HoEKSTRA et al 1985.…”

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Yield and Yield Stability in a Balanced System of Widely Differing Population Structures in Zea Mays L.

Schnell

Becker

1986

Plant Breeding

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With the view to study heterozygosity and heterogeneity as to their effects and interactions on yield and yield stability in maize, the following four types of population structure were formed from eight inbred lines: Homogeneous populations of homozygous plants (the eight inbred lines themselves); heterogeneous populations of homozygous plants (four blends containing four lines each); homogeneous populations of heterozygous plants (16 single crosses); heterogeneous populations of heterozygous plants (four blends containing four single crosses each, and four double crosses). This material was grown in three environments (years).At both levels of heterozygosity, the blends did not outyield the means of their respective components grown in pure stands. Yield stability of the various structural groups was ranked differently by ecovalence and the mean square for deviations from regression. By transforming the deviation mean squares into coefficients of variation it was possible to reveal improvements of stability not only by heterogeneity but also by heterozygosity, and additionally, an interaction of both factors in the sense of a diminishing return.The genetic structure of a plant population can be described by various criteria, which include (firstly) the degree of heterozygosity of the individuals contained in the population, and (secondly) the genotypic variation atnong those individuals, i. e., the degree of heterogeneity of the population. Considering heterozygosity and heterogeneity as factors with two levels each (i. e., homozygosity vs heterozygosity; hotnogeneity vs heterogeneity), one can visualize four possible types of population structure, all of which occur among the products of plant breeding. These types are as follows:Type I. Homogeneous populations of homozygous individuals (e. g., inbred lines; pure line varieties of selfpollinating species), Type n. Heterogeneous populations of homozygous individuals (e. g., bulks and multiline varieties in selfpollinating species).Type in. Homogeneous populations of heterozygous individuals (e. g., single cross hybrids; clone varieties).Type IV. Heterogeneous populations of heterozygous individuals (e. g., openpollinated and synthetic varieties; three-way and double cross hybrids). U.S.

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“…4). There is much evidence that increased plant-to-plant variability results in lower HI and grain yield (Pendleton & Seif 1962;Glenn & Daynard 1974;Hoekstra et al 1985;Ford & Hicks 1992;Fasoula & Fasoula 1997;Tollenaar & Wu 1998). Darwin (1868) pointed out that natural selection and artificial selection were opposite selective directions in the course of crop evolution from the early wild state to modern bred and cultivated types.…”

Section: Discussionmentioning

confidence: 99%

Effect of water control and plastic‐film mulch on growth and the range of size inequalities in spring wheat (Triticum aestivum) populations

2005

New Zealand Journal of Crop and Horticultural Science

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This study was conducted to determine the effect of water supply regimes and plastic-film mulching on the harvest index (HI), reproductive allocation (RA), and the range of size inequalities in spring wheat (Triticum aestivum) populations, and to explore the mechanisms causing them. Grain yield, biological yield, HI, and RA of spring wheat decreased significantly (P < 0.001) along the irrigation gradient (applied water decreased from 0.35 to 0.175 to 0 m 3 m -2 ). Either mulched or non-mulched, the range of size inequalities always increased. HI and RA in the mulched treatment were significantly lower than in the non-mulched treatment (P < 0.05). Results suggest that the range of size inequalities in spring wheat populations are closely correlated with the water regime in the field, and that under greater drought stress there are relatively smaller plants with lower HI. A greater range of size inequalities may result in growth redundancy. Appreciable growth redundancy occurred in spring wheat populations mulched with plastic film, which may result from the exacerbated interplant competition and self-thinning. Thus, spring wheat cultivation with plastic-film mulching was not the best method, although grain yields increased 38.5% in mulched treatments compared with non-mulched control plots.

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Grain Yield Comparison of Pure Stands and Equal Proportion Mixtures for Seven Hybrids of Maize

Abstract: Hoersrna, G. J., Ker.rNsNBERG

Cited by 24 publications

References 25 publications

Evaluation of Hybrid and OPV Maize Varieties for Grain Yield and Agronomic Attributes under Farmer's Field Conditions at Dukuchhap

Evaluation of Hybrid and OPV Maize Varieties for Grain Yield and Agronomic Attributes under Farmer's Field Conditions at Dukuchhap

Yield and Yield Stability in a Balanced System of Widely Differing Population Structures in Zea Mays L.

Effect of water control and plastic‐film mulch on growth and the range of size inequalities in spring wheat (Triticum aestivum) populations

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