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Evaluation of bioinoculant consortia for organic cultivation of ginger
Ginger is one of the major spice crops of Kerala. Several constraints hinder its production and the major one is its succeptibility to various diseases. This has led to the use of high doses of chemical pesticides. Ginger is also a highly nutrient exhausting crop, which demands use of high doses of...
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| Format: | Ph.D Thesis |
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Vellanikkara
Department of Agricultural Microbiology, College of Horticulture
2015
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| Subjects: |
| LEADER | 05122nam a22001817a 4500 | ||
|---|---|---|---|
| 082 | |a 660.62 |b HAR/EV | ||
| 100 | |a Haritha T R | ||
| 245 | |a Evaluation of bioinoculant consortia for organic cultivation of ginger | ||
| 260 | |a Vellanikkara |b Department of Agricultural Microbiology, College of Horticulture |c 2015 | ||
| 300 | |a xxiii, 78 Pages | ||
| 502 | |a MSc. | ||
| 520 | 3 | |a Ginger is one of the major spice crops of Kerala. Several constraints hinder its production and the major one is its succeptibility to various diseases. This has led to the use of high doses of chemical pesticides. Ginger is also a highly nutrient exhausting crop, which demands use of high doses of fertilizers. Although, chemical fertilizers and pesticides are highly effective, their continuous use has led to many environmental problems. Alternative approaches are therefore needed to minimize the use of chemical fertilizers and agrochemicals, since ginger is directly consumed. Emphasis should be given for the organic cultivation of ginger. The role of bioinoculants assumes special significance in this context. The magnitude of plant growth promoting activities is reported to be better in the case of consortia or mixed cultures than single strain. Therefore, bioinoculants formulation consisting of biofertilizer and biocontrol agent would be a novel technology which will provide nutrients as well as manage diseases. The literature on the use of consortia of biofertilizers and biocontrol agents are scanty. Hence, a study was undertaken on “Evaluation of bioinoculant consortia for organic cultivation of ginger’’ with an objective to evaluate and find a suitable consortia of bioinoculants for ginger cultivation. Azospirillum lipoferum, phosphate solubilizing bacteria (PSB), potash solubilizing bacteria (KSB), Pseudomonas fluorescens and Trichoderma viride cultures of KAU were used for the study. When tested for their compatibility with each other, it was found that Azospirillum lipoferum, PSB, KSB, Pseudomonas fluorescens were mutually compatible with each other. However, Pseudomonas fluorescens and Trichoderma viride were incompatible. Based on the compatibility test, consortia consisting of biofertilizers alone and biofertilizer + biocontrol agents were selected for the field evaluation. The consortia KAU-AZO +KAU- PSB + KAU-KSB, KAU-AZO + KAU-PSB + KAU-KSB + KAU-PF and KAU-AZO + KAU-PSB + KAU-KSB + KAU-TV were selected. These consortia were compared with individual bioinoculants, vii PGPR Mix I, PGPR Mix II, Organic adhoc package (KAU, 2009) and POP recommendation (KAU, 2011). Based on the overall biometric and yield parameters, T11 (Organic adhoc package, KAU, 2009) was found to be best among all the treatments evaluated. Among the consortia, days taken for germination was minimum (17.33) in the case of T6 (KAU-AZO+KAU-PSB+ KAU-KSB) while both T7 (KAUAZO+ KAU-PSB+ KAU-KSB +KAU-PF) and T8 (KAU-AZO+KAU-PSB+ KAUKSB +KAU-TV) recorded the highest per cent (91.67) germination. Plant height, number of tillers, and yield were maximum in T8 (KAU-AZO+KAU-PSB+ KAUKSB +KAU-TV). With regard to disease and pest incidence, T8 (KAU-AZO + KAU-PSB + KAU-KSB + KAU-TV) recorded minimum per cent rhizome rot (5.23%) incidence. However, T7 (KAU-AZO+KAU-PSB+ KAU-KSB +KAU-PF) recorded the minimum per cent incidence (5.21) of Rhizoctonia leaf blight and shoot-borer (4.17 %). The T6 treatment (KAU-AZO+KAU-PSB+ KAU-KSB) was the least succeptible (6.25 %) to rhizome maggots. At the time of harvest, T7 (KAU-AZO+KAU-PSB+KAU-KSB +KAU-PF) and T8 (KAU-AZO+KAU-PSB+ KAU-KSB +KAU-TV) recorded the lowest pH (5.30) and T8 (KAU-AZO + KAU-PSB+ KAU-KSB+ KAU-TV) registered highest available nitrogen (188.68 kg/ha) among the consortia. However, highest organic carbon (1.55 %) and available phosphorus (37.44 kg/ha) was recorded in T7 (KAU-AZO+KAU-PSB+KAU-KSB+ KAU-PF). All the consortial treatments were on par with each other with respect to available potassium content in soil. Population of inoculated individual and consortial isolates in soil indicated a decreasing trend till the time of harvest. The population decreased from 108 cfu/ml to 104 cfu/ml in the case of bacteria and 106 to 10 3 cfu/ml in the case of fungus. The Benefit:Cost ratio was maximum (1.65) in the case of T8 (KAU-AZO + KAU-PSB + KAU-KSB + KAU-TV). viii The present studies clearly indicated that consortia inoculated plants performed better than the individual isolates. The consortia of bioinoculants treated plants were on par, but T8 (KAU-AZO + KAU-PSB + KAU-KSB + KAUTV) was the most promising treatment among the consortia. Therefore, it can be concluded that bioinoculant consortia consisting of bioagents for nutrient fixation /solubilization (N, P, K) and fungicidal effect would be a novel technology in present-day agriculture. | |
| 650 | |a Agricultural Microbiology | ||
| 650 | |a Organic cultivation of ginger | ||
| 700 | |a Surendra Gopal K (Guide) | ||
| 942 | |2 ddc |c TH | ||
| 999 | |c 142684 |d 142684 | ||
| 952 | |0 0 |1 0 |4 0 |6 660_620000000000000_HAREV |7 1 |8 REF |9 141679 |a KAUCLV |b KAUCLV |c THESES |d 2016-04-11 |o 660.62 HAR/EV |p 173634 |r 2016-04-11 |w 2016-04-11 |y TH | ||