THE RESPONSE OF EIGHT CORN (<i>Zea mays</i> L.) HYBRIDS TO ZERO TILLAGE IN MANITOBA

“…Although researchers reported evidence of signiWcant GT (Brakke et al 1983;Wall and Stobbe 1983;Carter and Barnett 1987), the majority of the available studies reported non-signiWcant GT (Funnermark and Hallauer 1985;Hallauer and Colvin 1985;Karlen and Sojka 1985;Anderson 1986;Newhouse and Crosbie 1986;Kaspar et al 1987;Hersterman et al 1988;Duiker et al 2006). Brakke et al (1983) evaluated 169 maize genotypes in an experiment arranged in a partially balanced lattice design evaluated across three Nebraska locations (Alliance, ScottbluVs, and Sidney) in 1980.…”

Section: Genotype By Tillage Interactionmentioning

confidence: 97%

“…However, because they utilized diVerent plant populations, N fertilization rates, and water regimens between CT and NT, their estimation of GT could be inXated by genotype £ N, genotype £ water regimen, or genotype £ plant population interactions. Wall and Stobbe (1983) studied the GT of eight maize hybrids under CT and NT in one experiment arranged in a split-plot design with two planting densities at one location in Manitoba, Canada, during 1980 and 1981. They reported signiWcant GT for grain weight per ear for 1981 (1980 was not signiWcant).…”

Section: Genotype By Tillage Interactionmentioning

confidence: 99%

Do different production environments justify separate maize breeding programs?

et al. 2009

View full text Add to dashboard Cite

DiVerent production environments are being adopted by farmers. Therefore, allocation of resources to breeding research that targets diVerent production environments should be continuously assessed. Agronomists should conduct extensive hybrid £ production environment interaction research before recommending breeders to conduct separate breeding programs for each production environment. The lack of interactions between genotypes and production environments (e.g., tillage) would not justify conducting separate breeding programs and duplicating breeding resources. On the other hand, separate breeding programs would be necessary if cultivar rankings diVer. The purpose of this paper is to review the available literature on experiments designed to test genotype £ tillage interactions (GT) in maize (Zea mays L.). No-till system (NT) and conventional till system (CT) were utilized as examples of diVerent production environments. The majority of experiments reviewed showed that there is no need to develop cultivars speciWc to NT because the cultivars that were developed under CT systems performed relatively the same under NT. The magnitude of GT interactions found was very small to expect better cultivars from breeding under NT. Additional research is needed to conWrm these conclusions, especially when applied to other production environments (e.g., development of cultivars under organic conditions). Scientists should evaluate genotype by tillage interactions before investing additional resources in breeding for those speciWc target environments. Top yielding genotypes seem be consistent across years, locations, inputs; and most of the present evidence suggests that breeding for speciWc till systems is not necessary.

show abstract

“…One goal of plant breeding is the selection of hybrids with broad areas of adaptation, but selection can be difficult when yields differ because of water stress, conservation tillage, and variations in germplasm used in evaluation (3,28). An important consideration in the selection of a hybrid is the identification of root characteristics that may influence hybrid response.…”

Section: Introductionmentioning

confidence: 99%

A comparison of two methods for measuring potassium influx kinetics by intact corn seedlings¹

Mullins

Edwards

1989

Journal of Plant Nutrition

View full text Add to dashboard Cite

Growth chamber studies were conducted to compare two procedures for measuring potassium influx kinetics by intact corn (Zea mays L.) seedlings. It was assumed in both procedures that K uptake by corn followed Michaelis-Menten kinetics. In the first procedure (depletion method) corn seedlings were grown in complete nutrient solution for 7, 10, 14 and 28 days. The nutrient solution contained 500 μM K. Potassium influx kinetics were determined by transferring plants into nutrient solution containing 200 μM K and following the rate of K depletion from solution over time. In the second procedure (Hofstee method) six K concentrations ranging from 24 to 246 ΜM were established and maintained by daily additions of K. Corn seedlings were harvested from each of the six treatments at 7, 485 486 MULLINS AND EDWARDS 10, 14, 21 and 28 days and K was measured in the shoots and roots. Average net K influx rates were calculated for each treatment at each harvest date. Ihe average influx rates were paired with the measured average K concentrations in solution and K influx kinetics were determined with Eadie-Hofstee plots. Maximum K influx rates (Imax) determined by the Hofstee method were an average of 4.8 fold higher than Imax values determined by the depletion method. Michaelis-Menten constants (Km) determined by the depletion method were 2.3 fold higher than Km values determined by the Hofstee method.

show abstract

THE RESPONSE OF EIGHT CORN (Zea mays L.) HYBRIDS TO ZERO TILLAGE IN MANITOBA

Abstract: Studies were undertaken in 1980 For personal use only.

Cited by 21 publications

References 3 publications

Tillage-Induced Soil Changes and Related Grain Yield in a Semi-Arid Region

Tillage-Induced Soil Changes and Related Grain Yield in a Semi-Arid Region

Do different production environments justify separate maize breeding programs?

A comparison of two methods for measuring potassium influx kinetics by intact corn seedlings¹

Contact Info

Product

Resources

About

THE RESPONSE OF EIGHT CORN (Zea mays L.) HYBRIDS TO ZERO TILLAGE IN MANITOBA

Abstract: Studies were undertaken in 1980 For personal use only.

Cited by 21 publications

References 3 publications

Tillage-Induced Soil Changes and Related Grain Yield in a Semi-Arid Region

Tillage-Induced Soil Changes and Related Grain Yield in a Semi-Arid Region

Do different production environments justify separate maize breeding programs?

A comparison of two methods for measuring potassium influx kinetics by intact corn seedlings1

Contact Info

Product

Resources

About

A comparison of two methods for measuring potassium influx kinetics by intact corn seedlings¹