PRODUCTIVITY AND NATURAL STORAGE BEHAVIOUR OF TRUE POTATO SEED PROGENIES

A Thesis Submitted to the Department of Horticulture Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN HORTICULTURETwenty True Potato Seed (IPS) progenies supplied from Tuber Crops Research Centre (TCRC) of Bangladesh Agricultural Research Institute (BAR!) were evaluated during 2000-2001 Rr their yield potential in seedling tuber generation (F 1 C0 ) at Sher-e-Bangla Agricultural University (SAl)), Dhaka. Among them only nine progenies were selected as promising and evaluated iii their first clonal generation ([-',C l ) along with a check variety, Diamant for keeping quality under natural storage condition. The selected progenies were further evaluated in field during 200 1-2002 at same location. There existed si"nilicant variation among the progenies in seedling tuber generation for important plant growth parameters. In first clonal generation, the progenies showed significant variation for all the plant growth parameters studied except number and weight of tubers hill'. Tuberlets yield h&') was found to he highly correlated with foliage coverage, plant height, number of tuberlets plani', number of tuherlets m 2 and luherlek yield (kg 111-2 ) and direct cCkct was observed with these characters towards increasing tuberlets yield. Regarding post-harvest behaviour under natural storage, small and medium sized tubers performed significantly better storage life compared to large tubers. All the progenies showed superior storage life xvii (weight loss, rottage loss, days to sprouting and shrivelling etc.) than the check variety, Diamant. Based on both productivity and post-harvest behaviour under natural storage condition, the performances of three progenies namely; HPS-36419, HPS-9/67 and HPS-364/67 were found satisfactory

MIXING ABILITY AND INTER.-GENOTYPIC COMPETITION FROM 7x7 UNIBLENDS AND BIBLENDS OF SOYBEAN GENOTYPES

A Thesis By FIROZ MAIIMUD Sul'niitted to the Pepartment of Genetics anti Plant breeding angatiesh Agricultural University. Mymensingh in partial fulfilment of requirements for the degree of MASTER OF SCIENCE (MS) IN GENETICS AND PLANT BREEDINGMixing ability and inter-genotypic competition from 70 mechanical diallel mixtures excluding reciprocals of Soybean (Glycine mat L.) were studied, during November 2001-April 2002, under two experimental sets which provided for intra-row and interrow mixing of genotypes in biblend, designated respectively as Set I and Set 11, as well as uniblend stand in both. The significant differences among the genotypes were found for all the traits examined. The mean performance analysis showed that, the genotype PM-78 had earliness for flowering and maturity, and the biblends PM-fl + Ramsom and BS-3+ 85-16 exhibited earliest flowering and maturity behaviour. The genotype G-2 showed the best performance for pods/plant, seeds/plant, yield/plant, biological yield/plant, and yield/plot. Variances due to general mixing ability (GMA) and specific mixing ability (SMA) were significant for most of the traits. The predominant role of OMA variances were affirmed in all the characters studied. The genotype PM-iS was found to be the best general mixer for earliness in flowering and maturity in both experimental sets. The genotype BS-16 was found to be a good general mixer for plant height, branches/plant, yield/plant, biological yield/plant, and yield/plot in both the experimental sets. The genotype G-2 had a good mixing ability for pods/plant, seeds/S-pods and seeds/plant in the both experimental sets. Whilst the genotype BS-60 was found to be a good general mixer for harvest index in both experiments, as revealed by thcir respective uniblend stand. The mixture (biblend) BS-60 + 85-16 was earliest in flowering and maturity. The plant mixture BS-3+BS-16 was found to be a good specific mixer for plant height, branches/plant, pods/plant, seeds/plant, yield/plant, biological yield/plant, and yield/plot in experimental Set-I. But in experimental Set-Il, the mixture P13-l+BS-16 was found to be a good mixer for branches/plant, pods/plant, seeds/S-pods, seeds/plant, yield/plant, biological yield/plant, yield/plot and 100-seed weight. For experimental Set I, the biblend BS-3+BS-16 and for experimental Set lithe biblend PB-I +BS-1 6 were the best specific mixers

GENETIC STIDIFJS ON EDIBLE POD YIELD IN F2 DIALLEL POPULATION OF LABLAB BEAN (Lablabpurpureus L.)

A Thesis By JAM ILUR RAUMAN Examination Roll No. O1AgGPB-JD 13M Registration No. 20508 (1993-94) Semester July - December, 2002A 6 x 6 F2 diallel experiment (without reciprocal) on Lablab bean (Lablab purpurezt L.) was conducted to study combining ability and inheritance in some selected genotypes for pod yield and other related characters such as flowering, pod setting, no. of inllorescences per plant, no. of flowers per inflorescence, no. of pods per inflorescence, inflorescence length, pod length, pod width, 10-pod weight and 20-seed weight. There were significant variations among the genotypes for all the characters studied. Variances for general combining ability (gca) and specific combining ability (sea) were significant for ten out of eleven characters including pod yield per plant, suggesting the presence of both additive and non-additive components in the genetic systems of these characters. For days to l' flowering and I St pod setting, the genetic system was predominantly of non-additive gene action. The parental genotype DS-52 was found to be the best general combiner for early flowering, pod setting and 20-seed weight. The parent DSN-26 was the best general combiner for inflorescences per plant, pod length, pod width, 10-pod weight and also for pod yield per plant. For sea effect the cross DS-52 x DS-161 and DS-30 x DSN-26 were the best specific combiners for early flowering and early pod setting. For 10- pod weight and pod yield per plant the cross DSN-26 x KBS-3 and DS-30 x KBS-2 were the best specific combiners. Vr-Wr analysis relating to graphical presentation of major genetic features were done for all the eleven characters. Complete dominance was observed for pod yield per plant, partial dominance for no, of flowers per inflorescence, pod length, 10-pod weight, and 20-seed weight. While overdominance was recorded for days to l flowering, days to 1M pod setting, no. of infloreseenees per plant, no. of pods per inflorescence, inflorescence length and pod width. Components of variation and various genetic parameters such as degree of dominance, dominance ratio, narrow sense heritability etc. were estimated. Results showed that positive and negative alleles were in unequal proportion among the parents for all characters. The dominant alleles were in excess for all characters except pod length, pod width and 20-seed weight. Dominant and recessive genes were unequally distributed in the parents for all characters. High narrow sense heritability was observed for pod yield per plant and 10-pod weight, whereas for the others it was moderate to poor

Tolerance of Trichoderma, Gliocladium and Sclerotium to Agrochemicals and biocontrol potency of Trichoderma and Gliocladium

A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in Partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN PLANT PATHOLOGYn-vitro test reveled that Trichoderma harzianum could tolerate Vitavax, Tilt 250EC, Ridornil and Thiovit at 10001Jg/ml, while Gliocladium viride could grow better on PDA containing Ridomil and Thiovit. Trichoderma harzianum and Gliocladium viride could not tolerate even 100IJg/ml of Bavistin. On the other hand, Sclerotium rolfsii could not tolerate Vitavax, Tilt 250EC and Ridomil even at lOOlJglml, but Bavistin and Thiovit reduced the growth of Sclerotium rolfsii by 86.18% and 75.64%, respectively at 1000~glm) and IOOJ.1g1ml.Out of the nutrient elements tested, N, K, S and Mn reduced the growth of Trichoderma harzianum while slight induction in growth was recorded by P and Cu. Except P, the tested metal salts reduced the growth of Gliocladium vir ide, where higher concentration of Imetal salts in medium resulted- higher inhibition of growth. Nutrients showed inhibition of growth of Sclerotium rolfsii at increasing the cone. in medium. The antagonists were found potential against Sclerotium rolfsii. Seed treatment with antagonists resulted upto 21.61%, 53.5%, 26.64% and 48.43% increase in germination in mungbean, blackgram, pigeon pea and tomato, respectively and showed good effect on seed borne mycoflora. Moreover, significant growth enhancement of mungbean, blackgram and tomato have been achiev.ed by treating seeds with antagonists

FERTILITY MANAGEMENT OF A NEWLY DEVELOPED GENOTYPE OF PEA (Pisum sativzzrn L.)

A THESIS Submitted to Bangabandhu Sheikh Mujibur Rahman Agricultural University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE ('MS) Department of Soil Science Suintier Term, 1999A field experiment was conducted at the Bangabandhu Sheikh Mujibur Rahman Agricultural University farm (lUring the period from November 10, 1997 to March 1. 1998 to determine the optimum requirement of N, P, and K for maximum yield of the advanced line (Local \Vhite) of pea. There were 14 treatment combinations comprising of four levels of N (0, 30, 60, and 90 kg N/ha), four levels of p (0. 50. 75, and 100 kg P05/ha). 4 levels of K (0, 30, 60, and 90 kg K 2 R/iizobiuni strain (N 0 and N,04. 0 0/ha), two levels of inoculum as a 3. and one level of organic matter (cow dung) at the rate of 10 c/ha. Moderate rate of N. P. and K application (N 60 kg, P K1 0 : 60 kg/ha) was found to be the balanced combination of the nutrient elements to give the highest yield of green pod (13.12 f/ha) and matured seed (2.27 t/ha) and the maximum total uptake of N (123.62 kg/ha), P (4.78 205 75 kg, and kg/ha), and K (69.03 kg/ha) by the plants and as well as the largest sized green seeds (41.51 g) and matured seeds (17.68 g) per 100 seeds. Although. the lughest level of N application (90 kg/ha) with the same rates of P and K application produced the tallest plants (94.44 cm), maximum number of branches per plant (3.02) and the highest number of pods per plant (8.07) gave 4.5 % lower yield of green pods and 19.3 % lower yield of matured seeds and as well as 3.21 % lower uptake of N, 1.46 % P. and 13.42 % K as compared.to the highest yield and the highest nutrient uptake observed under moderate application of nutrients strain along with one third of optimum N (20 kg/ha) and moderate amount of P and K (75 kg P,O and 60 kg K elements. Seed inoculation with Rhizobiwn 2 0/ha) was found to be encouraging to give satisfactory and acceptable yield of 12.37 t/ha of green pod (only 5.7% lower than the highest yield) of pea. From the viewpoint of yield and nutrient uptake of garden pea and the nutrient requirement of the crop, the N, P. and K combination at the rates of 60 kg N, 75 kg PO, and 60 kg K 2 0/ha was considered to be die balanced combination of fertilizer nutrients for achieving the maximum output through cultivation of pea in Shallow Red-Brown Terrace Soil of BSMRAU farm