| This study was carried out to investigate the effects of intercropping garlic with pepper under plastic tunnel on overcoming the soil obstacles of continous growing pepper, on the production of enhanced garlic along with the biological and ecological mechanism. This research offered the orientation for establishing technology system by inter-planting pepper with garlic crop. The main results and conclusions are as follows:1. During the first year of experiment (2009-2010) it was recorded that plant growth parameters of pepper (plant height, stem diameter, number of flowers, fruit set and length & width of largest leaf) was at higher level in the treatment treated with garlic bulbs as compared to garlic cloves and control. However, during 2nd year of experiment (2010-2011) garlic intercropped with bulbs showed bad effects on this growth of pepper and it was significantly lower than garlic clove and control. From both the experiment it was concluded that pepper intercropped with garlic cloves showed better results as compared to intercropping with garlic bulbs and control.2. The fruit quality results showed that pepper intercropped with garlic reflected improvement in many parameters like total soluble solids, proteins contents and vitamin C. The levels of nitrite were also observed lower in case of pepper intercropping with garlic as compared to control during both the year of experiment (2009-2011). Significant higher concentration of capsaicin was recorded in the treatments intercropping with garlic as compared to control.3. During both the years of intercropping (2009-2011) the concentration of soil microbes was observed higher after one month of garlic intercropping as compared to control. Soil enzymatic matter activities also showed dynamic change after the intercropping of garlic. The level of soil nutrients (nitrogen, phosphorus and potassium) also observed higher in the treatments intercropping with garlic as compared to control.4. During two years of experiment the treatment intercropped with garlic cloves showed higher net income per unit land area as compared to garlic bulbs and control. It was also observed that the treatment intercropping with garlic bulb showed negative economic return even as compared to control (sole pepper crop).5. The root exudates of two different garlic cultivars:cv. Gailiang(G064) & Cangshan (G025) showed the various inhibitory effects against Phytophthora capsici, fungi of pepper both in mycelial growth and spore germination. All the treatments (i.e 25%,50%,75% & 100% root exudate concentrations) of garlic cultivar G025 showed less inhibition effects than cultivar G064. Inter-varietal inhibition effect comparison at 100% concentration (T4) exhibited 69.24% decline in hyphal growth for G064 cultivar, compared to 49.06% for G025 cultivar. Whereas, the size of mycellial growth measured in controlled situation was found significantly larger as compared to garlic treatments. The results of High Performance Liquid Chromatography (HPLC) revealed that garlic cultivar G064 possessed large amount of allicin as compared to G025. Scanning and transmission electron microscopy showed that the fungal hyphae treated with G064 exudates were misshaped, fragmented, and had smaller diameter with empty cytoplasmic contents in cell wall as Compared to those treated with G025 and the controls. Thus, the root exudates of G064 cultivar had significant fungicidal effect on Phytophthora capsici.From the findings of both in-vitro and in-vivo experiments we concluded that pepper intercropping with garlic can enhance the soil fertility, increase the income per land unit area and also inhibit the soil causing diseases which lead to organic vegetable production that is dire need of new era.
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