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Title of Thesis  
COMPARATIVE PERFORMANCE OF SUGARCANE VARIETIES AND GENOTYPE ENVIRONMENTAL INTERACTIONS  
Author(s)  
ABDUL QAYUM  
Institute/University/Department Details  
Sindh Agriculture University, Tandojam  
Status (Published/ Not Published/ In Press etc)  
Published  
Date of Publishing  
1998  
Subject  
Agronomy  
Number of Pages  
192  
   
Keywords (Extracted from title, table of contents and abstract of thesis)  
Sugercane, Sugercane Genotypes, Germination percentage, Number of tillers, Number of Millablestalks, Plant height, Stalk Diameter, Stalk Weight, Tons of Cane/Hectare, Brix of, EMG, MMG, BF 162, Ratoon crops, CP 69/1059, CP 77/400,  

 

 
Abstract  

Sixteen genotypes of sugarcane (S'accharum hybrid spp.) in two separate maturity groups were evaluated in Peshawar valley of NWFP during crop seasons 1990/91 to 1993/94. This study of comparative performance, or final evaluation was carried out with estimation of genotype-environment interactions as a precise method of selection. Early and mid maturing groups(EMG and MMG) constituted eight genotypes and a check variety. Almost all genotypes were derived from the already screened germ pool, secured from the Canal Point f (CP), Florida source, except BI;' 162, which was advanced to the present study from the Faisalabad source of Barbados/Faisalabad origin. The experiments were conducted at three locations at distinct ecological zones of the Valley, having severe, mild and frost-free growing and different soil conditions. The sites were infield location I at Mardan and out-field locations 2 and 3 at Peshawar and at Sakhakot of Malakand Agency. At each site, both the EMG and MMG cultivars were arranged in RCB design. Plot size, number of rows and replicates were marked according to the land pieces, but three replicates were counted finally. Three plant crops were harvested at each location, successively followed by three first - ratoon at location 1 and 2. Twelve principal characters, seven of them yield contributing and five of quality, besides seven ancillary/additional characters along with response of genotypes to frost and pests were examined in each plant crops. Still five more characters were studied in ratoon crops. Germination %, number of tillers and millable stalks/ha, stalk diameter and weight, tons of cane/ha (TCH), Brix, Pol %, Purity %, monthly commercial cane sugar (MCCS %) and monthly tons of sugar/ha (MTSH) were studied very keenly. Stability analyses, besides ANOVA were specifically conducted for all these characters. Simple statistical methods were used for lodging %, fiber %, and growth rate in stalks, leaves and internodes/plant, internodes and stalk length in plant crops together with tillers/stool, millable stalks, TCH, MCCS % and MTSH in ratoon crops. In plant crops, combined analyses of variance and estimates of variance components were computed for 12 principal characters under split-split plot arrangement in which locations and genotypes were fixed and years kept at random. The data were proceeded further for phenotypic stability, using Eberhart and Russell’s model (1966) –measuring regression coefficients (b) and mean square deviations. Combined analyses indicated significant genotypic and environmental (locations and years) effects by giving higher mean squares for most of the characters in the two groups. Genotypes x location interactions were significant for two yields, tour quality and two yield characters each in EMG. and MMG, respectively. G x Y interactions were significant for three Yield and all quality characters of EMG, whereas, L x G x Y Interactions were significant for TCH and MTSH of EMG. Means for most of the yield and quality characters were found higher in case of in-field location (Mardan), for early maturing genotype CP 69/1059 and mid maturing CP 77/400, while means for test years were varied. The variance components for .genotypes were significantly greater than their respective standard errors in case of 4 each of yield and quality: 4, 5 (yield, quality) characters of EMG and MMG respectively. Expected mean squares estimates for (, x L were significant for six and 7 characters of EMG and MMG, while for G x Y and L x. G x Y interactions these were also significant for some in both groups Years were noted highly effective in the expression of additional characters and response of genotypes to frost. In plant crops, stability analyses indicated that G x E interactions were found reduced and small for many of the characters studied, while regressions too were non-significant most of the characters of both groups. Some selections (especially CP 69/1059 and CP 77/400), however, demonstrated individual stability for a great number of characters. The study suggested that stability analyses could provide useful information on the performance of new sugarcane selections prior to release. Simple correlations were high among yield and quality characters, while genetic and phenotypic correlation coefficients of tillers with millable stalks and plant height were high and significant, however, low in other yield and even not existing in quality characters. In ratoon crops, MS and EMS for genotypes were significant for four and 2 characters respectively in case of EMG, while for all five and two in MMG. Locations, years and all -interactions were varied, The same varieties consistently emerged with higher mean yields and found outstanding in other Characters also.

 
   
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Sr.No Chapter Table of Contents
 
i 180.kbs
267.KB
1 1

INTRODUCTION

1
82.KB
2 2 REVIEW OF LITERATURE 7
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3 3 Aims and Objects of Saur Revolution 39
145.KB
4 4 RESULTS AND DISCUSSION 51
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5 5 SUMMARY 140
80.KB
6 6 CONCLUSIONS AND RECOMMENDATIONS 146
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7 7 LITERATURE CITED 149
91.KB
8 8 APPENIDICES 156
678.KB
9 9 SYNOPSIS 183
125.KB