Author: Andrew J. Tesha
Publisher:
ISBN:
Category : Nitrogen fertilizers
Languages : en
Pages : 258

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Author: Jean Pierre Mvondo Awono
Publisher:
ISBN:
Category :
Languages : en
Pages : 242

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Author: M. Bänzinger
Publisher: CIMMYT
ISBN: 9706480463
Category :
Languages : en
Pages : 69

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Introduction - why breed for drought and low N tolerance?; Conceptual framework - breeding; Conventional approaches to improving the drought and low N tolerance of maize; Conventional approaches challenged; The challenge of breeding for drought and low N tolerance; Maize under drought and low N stress; Conceptual framework - physiology; Water and the maize plant; Nitrogen and the maize plant; Maize under drought and low N stress - consequences for breeding; Stress management; Drought; Low N stress; Statistical designs and layout of experiments; Increasing the number of replicates; Improved statistical designs; Field layout; Border effects from alleys; Secondary traits; Why use secondary traits?; How do we decide on the value of secondary traits in a drought or low N breeding program?; Secondary traits that help to identify drought tolerance; Secondary traits that help to identify low N tolerance: Selection indices - Combining information on secondary traits with grain yield; Combining information from various experiments; Breeding strategies; Choice of germplasm; Breeding schemes; Biotechnology: potential and constraints for improving drought and low N tolerance; The role of the farmer in selection; What is farmer participatory research and why is it important?; What is new about farmer participatory research?; Participatory methodologies.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 572

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Author: John Michael Gier
Publisher:
ISBN:
Category : Nitrogen fertilizers
Languages : en
Pages : 118

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Author: Ali Munawar
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 186

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Author: Patrick Bioma Kiadii
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 144

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Book Description

Author: Jonathan Anthony Sisson
Publisher:
ISBN:
Category : Sweet corn
Languages : en
Pages : 116

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Book Description
The effects of planting date on mineral element concentration in sweet corn (Zea mays L. cv. Jubilee) at six developmental stages and on yield were investigated. Planting dates were chosen to correspond to early, mid-season, and late commercial plantings. Two nitrogen rates were applied since nitrogen is more often limiting than any other nutrient for sweet corn grown in Western Oregon. Boron was also applied since it has been shown to be limiting in many other crops grown in the Willamette Valley. Planting date significantly affected N, P, K, Ca, Mg, Mn, Fe, Cu, B, and Zn concentration in the whole plants during the vegetative growth stages and in the ear leaves during the stages between tasseling and harvest. During the early stage of growth, N, P, K, Ca, Mg, B, and Zn tended to be higher in the early planted corn plants, while later in the development of corn the effects of planting date were more variable. Planting date also affected the fresh and dry weight of whole plants; the later planting produced more dry weight than the earlier two plantings, while the early planted corn produced more fresh weight at harvest than the later two plantings. Consequently, when analyzing sweet corn for nutritional status, date of planting should be considered when interpreting the plant analysis data. The application of B had no effect on yield, fresh weight or dry weight and only increased B concentration at the first developmental stage. The additional application of N, did not significantly increase yield for the late planted corn, but did for early planted corn. N concentration, as well as Mg, Mn, Cu, and Zn concentrations increased with the higher rate of N fertilizer applied (125 kg/ha). Fresh weight and dry weight were both higher in the plants receiving the higher rate of N, with the difference becoming greater as the plants matured.

Author:
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 68

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Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 604

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