Nitrogen Efficiency in Tropical Maize (Zea Mays L.) PDF Download
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Author: Heidi Heuberger
Publisher:
ISBN: 9783861861928
Category :
Languages : en
Pages : 182
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Author: Heidi Heuberger
Publisher:
ISBN: 9783861861928
Category :
Languages : en
Pages : 182
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Author: Bartholomew Inzalishi Muruli
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 90
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Author: Dalmas Owino Sigunga
Publisher:
ISBN: 9789054856818
Category : Corn
Languages : en
Pages : 207
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The general objectives of this study were to increase the understanding of nitrogen (N) losses in maize cropping on Vertisols, and to develop management options to reduce such losses and to improve fertilizer N use efficiency. The specific objectives were. to quantify the effects of fertilizer N sources and management practices on (i) fertilizer N losses through denitrification, NH3 volatilization and bypass flow, (ii) fertilizer N use efficiency by maize, considering agronomic, recovery, and physiological N efficiencies, and (iii) the uptake of nutrients other than N. Both laboratory- and field-based investigations were conducted. Laboratory experiments were carried out to identify and rank the factors influencing denitrification, NH3 volatilization, and bypass flow. Field experiments were conducted to test various management options. It was found that the critical soil moisture content for denitrification to commence was 60% of the water holding capacity (WHC), but substantial denitrification occurred at 80% WHC. Denitrification rate depended primarily on soil moisture content and available C. The amount of N lost through denitrification was determined by both the rate and duration of denitrification. From the laboratory investigations it was confirmed that NH3 volatilization depended primarily on soil pH and fertilizer properties. It was also found that Kenya Vertisols have pH ranging between 5.5 and 9.1, indicating different potentials for NH3 volatilization. Incorporating fertilizer materials within the 0-5 cm soil layer significantly reduced NH3-N losses. Nitrate-N was the main N-form in which N was recovered in the bypass flow, and the amount of N recovered increased with increasing rate of N03-N application. NH4-N treatment had no effect on N loss through bypass flow. The results showed that bypass flow can be an important avenue of N03-N loss from Vertisols especially if applied early in the season when the characteristic cracks of Vertisols have not closed. Drains, 40 and 60 cm deep, led to deeper rooting depth and higher yields of maize than the 0 and 20 cm deep drains. Besides, the uptake of N, P, and K was higher on drained than undrained plots. The late maturing hybrid H614 was superior to early maturing H511 in terms of N uptake and nitrogen use efficiency. It is recommended that 40 cm deep drains with inter-drain spacing of 15 - 20 metres be provided as prerequisite step in the management of Vertisols for maize production.
Author: Juan Luis Rouanet M.
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
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Author: Paolo Borsa
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: KIRAN M. V
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Author: Mosisa Worku
Publisher:
ISBN:
Category :
Languages : en
Pages : 218
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Author: Jeff L. Bennetzen
Publisher: Springer Science & Business Media
ISBN: 0387794182
Category : Science
Languages : en
Pages : 593
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Book Description
Handbook of Maize: Its Biology centers on the past, present and future of maize as a model for plant science research and crop improvement. The book includes brief, focused chapters from the foremost maize experts and features a succinct collection of informative images representing the maize germplasm collection.
Author: Jeff L. Bennetzen
Publisher: Springer Science & Business Media
ISBN: 0387778632
Category : Technology & Engineering
Languages : en
Pages : 785
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Book Description
Maize is one of the world’s highest value crops, with a multibillion dollar annual contribution to agriculture. The great adaptability and high yields available for maize as a food, feed and forage crop have led to its current production on over 140 million hectares worldwide, with acreage continuing to grow at the expense of other crops. In terms of tons of cereal grain produced worldwide, maize has been number one for many years. Moreover, maize is expanding its contribution to non-food uses, including as a major source of ethanol as a fuel additive or fuel alternative in the US. In addition, maize has been at the center of the transgenic plant controversy, serving as the first food crop with released transgenic varieties. By 2008, maize will have its genome sequence released, providing the sequence of the first average-size plant genome (the four plant genomes that are now sequenced come from unusually tiny genomes) and of the most complex genome sequenced from any organism. Among plant science researchers, maize has the second largest and most productive research community, trailing only the Arabidopsis community in scale and significance. At the applied research and commercial improvement levels, maize has no peers in agriculture, and consists of thousands of contributors worthwhile. A comprehensive book on the biology of maize has not been published. The "Handbook of Maize: the Genetics and Genomics" center on the past, present and future of maize as a model for plant science research and crop improvement. The books include brief, focused chapters from the foremost maize experts and feature a succinct collection of informative images representing the maize germplasm collection.
Author: H. R. Lafitte
Publisher: CIMMYT
ISBN: 9789686127836
Category : Technology & Engineering
Languages : en
Pages : 132
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Book Description
