Evaluation Of Some Seeding Guava Trees And Their Vegetative Propagation By Cuttings:

Mohamed Abdu Abd Allah Ali Al-mounify

Although guava is COnsidered a popular and cheap fruit, but its Cultivation is faced by a limitationOwing to tree variability in all tree characteristics(growth, fruiting and fruit quality) as aresult of being arised from seed mUltiplication.In order to encourage horizontal and vertical expansionof guava production, one can select Some trees to be clones Or varieties on the bases of tree productivityand fruit quality.Furthermore, the selected trees should be maintained genetically constant throughvegetati ve propagation.study includes two parts :ConseqUently,the presntPart I, Rvaluation of same seedling guaVa trees This study Was carried out through two consecutiveseasons 1985 and 1986 On twenty-nine seedling guava trees of 7 years-old, grown at 5x5 m. aparton clay loam soil at the Experiment Station of the Faculty of Agriculture, MOshtohor. The trees werenearly similar in size. The obtained results could be summarized as follows:I- Tree growth.1- Vegetative growtha- All the studied trees Varied greatly in all growth phases i.e. shoot length, increasein shoot length, No. of leaves/shoot, leaf length, width and shape. As well as leafdry weight and leaf area.b- c’ 0 f 0” ’;h re b’,’.c ’2’ ;:’ betweenI-.f al”e.aits length and Width, it Was found that.leaf area;=: 0.70 Jc leaf lengthleaf width (em.)(em. )Leaf nutrients Contentleaf The trees under study differed greatly in their nutrients COntent of nitrogen, potaSSium, calcium and magnesium. phoSPhorus,II- Pruit set and frUit DROPFruit Set percentages of the studied trees Were high, since it ranged hetween 88. meanwhile, fruit June DROP Varied between 16.61-25.17%,whi1~. preharvest DROP ranged between 5.76-12.39%.All the studiedtrees differed in fruit set,June DROP and preharvest DROP.111- Fruiting a- Trees L7 s La s MIa & M12 & H2 and Lg gave the highest yield as kg./tree. b- Trees Land La produced the largest numberof fruits/tree as compared with other trees.c- The highest values of yield as kg./cm2 of trunkcrosssectional area were obvious with treesV_- Fruit quality1- Fruit physical propertiesAll trees showed great differences in all fruitphysical properties i.e. fruit weight, length,diameter, index, pulp thickness, pulp firmness, seedsw8ight, percentage, seeds number, weight of 100 seeds,and fruit colour.2- Fruit chemical propertiesa- Frui ts of trees Fl & J 11 & F7 & A2JI contained the highest percentagesoluble solids.b- Trees MIa & 06 & L4 & Hll s L2 & L7 & La &01& J12and Lg produced fruits with the lowestcontent of acidity.& LS andof total c- The highest ratios ofwith fruits of trees L4and La.The richest fruits in-118T.s.s./acid were found& L2 & D6 & MIO & L7dascorbicacid contentwere produced by trees H2 & Jl & M12 & J9 &LIO & J6 & J9 & B3 & La & Kg and L12•e- Fruits of trees JII and FI contained the highestpercentage of total sugars as compared withthose of other trees.v- Evaluation of seedling guava treesSome fruit physical and chemical propertiesof great importance in determining fruit qualitywere considered in evaluating the studied trees.These properties were: f rui t weigh+:1 pu Lp thic!