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Improvement in Grain and Fodder Yields of Early-Maturing Promiscuous Soybean Varieties in the Guinea Savanna of Nigeria
Thirteen early-maturing and promiscuously nodulating soybean [Glycine max (L.) Merr.] varieties that belonged to maturity group I developed at the International Institute of Tropical Agriculture (IITA) from 1980 to 1996 were evaluated at two locations in the Guinea savanna of Nigeria in 2001 and 200...
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Published in: | Crop science 2009-11, Vol.49 (6), p.2037-2042 |
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description | Thirteen early-maturing and promiscuously nodulating soybean [Glycine max (L.) Merr.] varieties that belonged to maturity group I developed at the International Institute of Tropical Agriculture (IITA) from 1980 to 1996 were evaluated at two locations in the Guinea savanna of Nigeria in 2001 and 2002 to determine genetic gain in grain yield and associated agronomic traits. The varieties were grown in a randomized complete block design with four replications. Data on grain yield and seven other traits were recorded. The study showed that grain yield potential of the soybean varieties increased from 1117 to 1710 kg ha–1 during two decades of breeding in IITA. The average rate of increase per year per release period (1980–1996) was 24.2 kg ha–1, which is 2.2%. Fodder yield also showed an annual increase of 22.81 kg ha–1 yr–1. Recent varieties had better lodging resistance scores of 1.25 to 1.37 in a 1 to 5 scoring scale (1 being resistant and 5 susceptible), shattering resistance scores of 1.6 to 2.7, and improved natural nodulation scores of 3.1 to 3.9. Old varieties had 50% or more pod shattering while the corresponding figure for new varieties was around 25%. Old varieties produced few and small nodules, while new varieties had many big nodules although size and number of nodules alone may not necessarily indicate nodule efficiency in N2 fixation. Grain yield showed a positive and highly significant (P |
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Merr.] varieties that belonged to maturity group I developed at the International Institute of Tropical Agriculture (IITA) from 1980 to 1996 were evaluated at two locations in the Guinea savanna of Nigeria in 2001 and 2002 to determine genetic gain in grain yield and associated agronomic traits. The varieties were grown in a randomized complete block design with four replications. Data on grain yield and seven other traits were recorded. The study showed that grain yield potential of the soybean varieties increased from 1117 to 1710 kg ha–1 during two decades of breeding in IITA. The average rate of increase per year per release period (1980–1996) was 24.2 kg ha–1, which is 2.2%. Fodder yield also showed an annual increase of 22.81 kg ha–1 yr–1. Recent varieties had better lodging resistance scores of 1.25 to 1.37 in a 1 to 5 scoring scale (1 being resistant and 5 susceptible), shattering resistance scores of 1.6 to 2.7, and improved natural nodulation scores of 3.1 to 3.9. Old varieties had 50% or more pod shattering while the corresponding figure for new varieties was around 25%. Old varieties produced few and small nodules, while new varieties had many big nodules although size and number of nodules alone may not necessarily indicate nodule efficiency in N2 fixation. Grain yield showed a positive and highly significant (P <or= 0.01) correlation coefficient (r = 0.75) with fodder yield, implying that high biomass could serve as an indicator of good yielding ability.</description><identifier>ISSN: 0011-183X</identifier><identifier>EISSN: 1435-0653</identifier><identifier>DOI: 10.2135/cropsci2009.02.0081</identifier><identifier>CODEN: CRPSAY</identifier><language>eng</language><publisher>Madison: Crop Science Society of America</publisher><subject>agronomic traits ; Agronomy. Soil science and plant productions ; Biological and medical sciences ; correlation ; crop yield ; Data collection ; early development ; forage crops ; forage legumes ; Fundamental and applied biological sciences. 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Merr.] varieties that belonged to maturity group I developed at the International Institute of Tropical Agriculture (IITA) from 1980 to 1996 were evaluated at two locations in the Guinea savanna of Nigeria in 2001 and 2002 to determine genetic gain in grain yield and associated agronomic traits. The varieties were grown in a randomized complete block design with four replications. Data on grain yield and seven other traits were recorded. The study showed that grain yield potential of the soybean varieties increased from 1117 to 1710 kg ha–1 during two decades of breeding in IITA. The average rate of increase per year per release period (1980–1996) was 24.2 kg ha–1, which is 2.2%. Fodder yield also showed an annual increase of 22.81 kg ha–1 yr–1. Recent varieties had better lodging resistance scores of 1.25 to 1.37 in a 1 to 5 scoring scale (1 being resistant and 5 susceptible), shattering resistance scores of 1.6 to 2.7, and improved natural nodulation scores of 3.1 to 3.9. Old varieties had 50% or more pod shattering while the corresponding figure for new varieties was around 25%. Old varieties produced few and small nodules, while new varieties had many big nodules although size and number of nodules alone may not necessarily indicate nodule efficiency in N2 fixation. Grain yield showed a positive and highly significant (P <or= 0.01) correlation coefficient (r = 0.75) with fodder yield, implying that high biomass could serve as an indicator of good yielding ability.</description><subject>agronomic traits</subject><subject>Agronomy. Soil science and plant productions</subject><subject>Biological and medical sciences</subject><subject>correlation</subject><subject>crop yield</subject><subject>Data collection</subject><subject>early development</subject><subject>forage crops</subject><subject>forage legumes</subject><subject>Fundamental and applied biological sciences. 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Soil science and plant productions</topic><topic>Biological and medical sciences</topic><topic>correlation</topic><topic>crop yield</topic><topic>Data collection</topic><topic>early development</topic><topic>forage crops</topic><topic>forage legumes</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Genetics</topic><topic>Genetics and breeding of economic plants</topic><topic>Glycine max</topic><topic>lodging resistance</topic><topic>nitrogen fixation</topic><topic>nodulation</topic><topic>plant breeding</topic><topic>pods</topic><topic>Regression analysis</topic><topic>savannas</topic><topic>seed shattering</topic><topic>Soybeans</topic><topic>yield components</topic><topic>yield potential</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tefera, H</creatorcontrib><creatorcontrib>Kamara, A.Y</creatorcontrib><creatorcontrib>Asafo-Adjei, B</creatorcontrib><creatorcontrib>Dashiell, K.E</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Agricultural Science Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>STEM Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni)</collection><collection>ProQuest Central</collection><collection>ProQuest Agriculture & Environmental Science Database</collection><collection>ProQuest Central Essentials</collection><collection>AUTh Library subscriptions: ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>SciTech Premium Collection (Proquest) (PQ_SDU_P3)</collection><collection>ProQuest Engineering Collection</collection><collection>Agriculture Science Database</collection><collection>ProQuest_Research Library</collection><collection>Science Journals (ProQuest Database)</collection><collection>ProQuest Engineering Database</collection><collection>Research Library (Corporate)</collection><collection>Environmental Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>Environmental Science Collection</collection><collection>ProQuest Central Basic</collection><collection>University of Michigan</collection><collection>SIRS Editorial</collection><jtitle>Crop science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tefera, H</au><au>Kamara, A.Y</au><au>Asafo-Adjei, B</au><au>Dashiell, K.E</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Improvement in Grain and Fodder Yields of Early-Maturing Promiscuous Soybean Varieties in the Guinea Savanna of Nigeria</atitle><jtitle>Crop science</jtitle><date>2009-11</date><risdate>2009</risdate><volume>49</volume><issue>6</issue><spage>2037</spage><epage>2042</epage><pages>2037-2042</pages><issn>0011-183X</issn><eissn>1435-0653</eissn><coden>CRPSAY</coden><notes>http://dx.doi.org/10.2135/cropsci2009.02.0081</notes><notes>http://hdl.handle.net/10113/37344</notes><notes>All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.</notes><abstract>Thirteen early-maturing and promiscuously nodulating soybean [Glycine max (L.) Merr.] varieties that belonged to maturity group I developed at the International Institute of Tropical Agriculture (IITA) from 1980 to 1996 were evaluated at two locations in the Guinea savanna of Nigeria in 2001 and 2002 to determine genetic gain in grain yield and associated agronomic traits. The varieties were grown in a randomized complete block design with four replications. Data on grain yield and seven other traits were recorded. The study showed that grain yield potential of the soybean varieties increased from 1117 to 1710 kg ha–1 during two decades of breeding in IITA. The average rate of increase per year per release period (1980–1996) was 24.2 kg ha–1, which is 2.2%. Fodder yield also showed an annual increase of 22.81 kg ha–1 yr–1. Recent varieties had better lodging resistance scores of 1.25 to 1.37 in a 1 to 5 scoring scale (1 being resistant and 5 susceptible), shattering resistance scores of 1.6 to 2.7, and improved natural nodulation scores of 3.1 to 3.9. Old varieties had 50% or more pod shattering while the corresponding figure for new varieties was around 25%. Old varieties produced few and small nodules, while new varieties had many big nodules although size and number of nodules alone may not necessarily indicate nodule efficiency in N2 fixation. Grain yield showed a positive and highly significant (P <or= 0.01) correlation coefficient (r = 0.75) with fodder yield, implying that high biomass could serve as an indicator of good yielding ability.</abstract><cop>Madison</cop><pub>Crop Science Society of America</pub><doi>10.2135/cropsci2009.02.0081</doi><tpages>6</tpages></addata></record> |
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subjects | agronomic traits Agronomy. Soil science and plant productions Biological and medical sciences correlation crop yield Data collection early development forage crops forage legumes Fundamental and applied biological sciences. Psychology Genetics Genetics and breeding of economic plants Glycine max lodging resistance nitrogen fixation nodulation plant breeding pods Regression analysis savannas seed shattering Soybeans yield components yield potential |
title | Improvement in Grain and Fodder Yields of Early-Maturing Promiscuous Soybean Varieties in the Guinea Savanna of Nigeria |
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