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2011 - 20122
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Subject: Agricultural Biochemistry × End date: 2012 × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    BIOCHEMICAL BASIS OF HARDSEEDEDNESS IN VIGNA SPECIES
    (2011) Ahuja, Richa
    The present investigation was undertaken to study percent hardseededness, seed coat constituents and variation in the biochemical composition of cotyledonary tissue of 10 Vigna species viz., SML832, PAU911, SML668, ML818, MASH218, MASH1008, MASH338, MASH114, RBL1 and RBL6. Seeds from these Vigna species were stored in cloth bags for 180 days at room temperature and the effect of storage period on germinability, vigor index and chemical composition of seeds was studied. The % hardseededness in different Vigna species varied from 14-82% at 24 h and 8-68% after 48 h soaking period. The % hardseededness in different Vigna species decreased with storage of seeds upto 180 days under ambient conditions. The seed coats of hard lines contained higher cellulose and hemicellulose content as compared to those from soft lines. There was non-significant variation in the % neutral detergent fiber, % acid detergent fiber and tannin content in seed coats and total soluble sugars, reducing sugars, phenols and phytate content in the cotyledonary tissue of these Vigna species. However, total lipid content varied significantly. At harvest, the germination % and vigor index values were higher in soft lines as compared to hard lines. The germination % and vigor index values in hard lines increased with the storage period upto 180 days. Lipid peroxidation values increased significantly with storage period in seeds of various Vigna species studied whereas catalase and peroxidase activities decreased. The total lipid content in seeds of all the Vigna species decreased whereas phenolic content increased with the storage period. The results of the present study suggests that although the % hardseededness in different Vigna species decreases with increasing storage period but the seed deterioration occurs with the passage of time.
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    Productivity of cotton (Gossypium hirsutum L.) in relation to organic and inorganic nutrition
    (Punjab Agricultural University, Ludhiana, 2012) Jagdeep Singh; Saini, K. S.
    A field investigation entitled, “Productivity of cotton (Gossypium hirsutum L.) in relation to organic and inorganic nutrition” was carried out at Student’s Research Farm, Department of Agronomy, Punjab Agricultural University, Ludhiana during kharif 2011. The experimental field was under organic vs chemical farming system with permanent layout from 1996. Eight treatments N50(FYM)+GM+RI, N50(FYM)+GM+RR, N75(FYM)+RI, N75(FYM)+RR, N50(F)+GM+RI, N50(F)+GM+RR, N75(F)+RI, N75(F)+RR were studied under randomized block design (RBD). The soil of the experimental field was sandy loam with normal pH and EC, high in OC, P and medium in N and K in organic treated plots and medium in OC and K, low N and high P in inorganic treated plots. Microclimate of crop canopy was modified by the treatments where nitrogen was applied through organic source by increasing PARI % and relative humidity and by decreasing soil and crop canopy temperature. Yield attributing character like higher dry matter production, monopodial and sympodial branches, number of picked bolls were significantly higher in treatments where nitrogen was applied through organic source of nutrition as compared to inorganic source of nutrition. Hence maximum seed cotton yield (25.8 q ha -1 ) was recorded with N50(FYM)+GM+RI which was 29.6 % higher than N75(F)+RR i.e. recommended dose of fertilizer. Fibre quality parameter like fibre fineness, fibre elongation, fibre strength, Rd value and b + was not affected significantly by organic and inorganic source of nutrition. GOT, seed index and lint index was also unaffected by different source of nutrition. Oil content of cotton seed was significantly higher with N75(FYM)+RI i.e. 19.85 percent. Soil physico-chemical properties were also improved by organic source of nutrition as compared to inorganic source of nutrition