in order to study drought tolerance indices and to introduce tolerant maize hybrids in drought conditions, an experiment was conducted at the experimental field of seed and plant improvement institute, in 2009. the experiment was carried out using split-plot in a randomized complete block design (crbd) with three replications. the main plots consisted of three levels of irrigation regimes (irri...

Corn kernels are characterised by the presence of all nutrients, macro- and microelements necessary for growth development in an easily digestible form. Considering differentiation soil climatic zones cultivation, breeding process is designed to establish hybrids different maturity groups. The research purposes evaluate maize groups a set economic biological traits productivity, high-yield stab...

The European corn borer completes two to three generations per year in Illinois. Fourth and fifth instars tunnel in stalks, causing disruption in the flow of water and nutrients in the plants. The cavities created by the borers may weaken stalks and ear shanks, resulting in lodging or dropped ears. Before the advent of Bt corn, producers attempted to control European corn borers, if the need ar...

A genetically modified Bt176 corn hybrid, which contains an insecticidal protein against the European corn borer, and its conventional, nonmodified counterpart were evaluated in 4 separate trials to verify substantial equivalence in feeding value and animal performance. Thirty-six individually kept laying hens and 3 replicates of 94 broiler chickens each, assigned to 12 cages, were fed 2 differ...

in this study 18 forage corn (zea mays l.) hybrid varieties were evaluated based on rcbd with four replications in khorasan razavi agricultural and natural resources research centre, iran, on 2008-2009. result of analysis of variance showed that there was significantly difference between hybrids in forage yield, ear weight and ear to biomass ratio. results of hybrids mean comparison with duncan...

BACKGROUND Transgenic corn engineered with genes expressing insecticidal toxins from the bacterium Bacillus thuringiensis (Berliner) (Bt) are now a major tool in insect pest management. With its widespread use, insect resistance is a major threat to the sustainability of the Bt transgenic technology. For all Bt corn expressing Cry toxins, the high dose requirement for resistance management is n...

NCH 4 Revised April 1993 Despite signifi cant progress made over the years, disease is still a major factor limiting corn production in the U.S. Estimates of annual yield losses in corn due to disease range from 7 to 20 percent nationally (Shurtleff, 1980). Using a 12 percent average, that’s nearly 1 billion bushels. Without the development of new hybrids, the losses would easily be more than d...

Abstract The objective of this work was to identify, by molecular analysis, the species genus Helicoverpa in corn, soybean, and lucerne Bt non-Bt crops, central Argentina. A total 1,343 carterpillars were analyzed PCR-RFLP. zea only detected on most corn hybrids. H. gelotopoeon predominated soybean lucerne, larvae occurred low proportion. did not show spp. infestations. exotic armigera found, t...

The current concern of nutrient loading waterways and soils from livestock manure has increased awareness of methods to reduce excess nutrient excretion. The initial methods for nutrient reduction are simple diet manipulations to feed nearer the requirement of the pig. Further modifications have been made to increase digestibility of feedstuffs. The use of genetically modified corns and additio...

Triticum aestivum L.). These high application levels result in low N use efficiency (NUE), with estimates of Maintaining current high yields of corn (Zea mays L.) grown in NUE for world cereal grain production systems at only the USA poses an environmental threat due to continued overuse of 33% (Raun and Johnson, 1999). This represents a $15.9 water and N inputs. To reduce overreliance on input...