1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)

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    Fertiliser management in cassava- Groundnut intercropping system
    (Department of Agronomy, College of Horticulture, Vellanikkara, 1985) Bridgit, T K; Sreedharan, C
    An experiment was conducted at Agricultural Research Station, Mannuthy, to study the effect of levels of N and time of application of N and K in a cassava- groundnut intercropping system. This 2x2x4 factorial experiment was laid out in randomized Block design with three replications under rainfed conditions. The study revealed that intercropping cassava with groundnut enhanced the growth parameters of cassava at all stages of growth. Yield attributes, yield and total drymatter production of cassava were also increased by intercropping. The quality characters like drymatter starch and crude protein content of tubers were improved by intercropping. Hundred percent recommended dose of N increased the growth, yield and quality over 75 percent of the recommended dose. Among the time of application T3 (15, 75 and 120 DAP) has given the highest tuber yield (21.92t ha-1) followed by T1 (15,60 and 90 DAP) of 21.65 t ha-1. T4 (basal, 60 and 90 DAP) which is the recommended dose recorded the lowest yield of 17.9 t ha-1. A comparatively higher utilization index was obtained with intercropping and higher level of N (75kg ha -1). T1 andT1 and T3 recorded more UI values than T2 and T4. The nutrient content as well as up take in cassava was increased by legume intercropping and higher levels of N. T1 and T3 recorded more nutrient content in different plant parts as compared to T2and T4. The fertility status of the soil was improved by intercropping and levels of N. Yield of ground nut was influenced by higher levels of N. Yield of groundnut was influenced by higher levels of N and time of application of N and K to cassava.T2 and T4 recorded more yield. Nutrient content and up take of bhusa was not influenced by levels of N and time of application of N and K. Maximum LER was seen in sole cassava plot when N and K was given at 15,75 and 120 DAP while in intercropped plot it was highest when N and K were given at 15,60 and 90DAP. Income from cassava cultivation was increased by intercropping with groundnut application of N and K at 15, 75 and 120DAP. Groundnut can be intercropped successfully with cassava under Kerala condition and a substantial quantity (25 per cent) of fertilizer nitrogen required by the main crop could be saved by this practice. For getting better fertilizer use efficiency of applied N and K fertilisers, 1st dose should be applied at 15 DAP of cassava instead of the now recommended basal Dose. Second dose can be extended up to 75 days of planting and the last dose up to 120 DAP so as to coincide with the harvest of the intercrop and the earthing up of cassava.
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    Studies on host-varietal specificity for Rhizobium for nodulation in groundnut
    (Department of Plant Pathology, College of Agriculture, Vellayani, 1982) Girija, V K; Sasi Kumar Nair
    An investigation was carried out at the College of Agriculture, Vellayani, Kerala to study the host-varietal specificity, if any, for Rhizobium for nodulation in groundnut. A total of fifteen groundnut varieties were subjected to a preliminary screening on the basis of the number of nodules formed and arranged into five distinct nodulation groups. Seven varieties of groundnut TMV-12, USA-123 Exotic-6, Spanish Peanut, TMV -11, Ak12-24 and Ah-32 were selected from among these groups for use in further studies.
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    Evaluation of fertigation vis a vis nutrient stick and foliar silicon in oriental pickling melon (cucumis melo var. conomon)
    (Department of Soil Science and Agricultural Chemistry, College of Agriculture, Padannakkad, 2018) Mubarack, O P; Suresh, P R
    The investigation on "Evaluation of fertigation vis a vis nutrient stick and foliar silicon in oriental pickling melon (Cucumis melo var. conomon )'was undertaken with the objectives to prepare and formulate nutrient stick, to evaluate and compare its effect with fertigation and foliar silicon on growth, yield and nutrient uptake in oriental pickling melon. The investigation was carried out in two parts, formulation of nutrient stick and field experiment at College of Agriculture Padannakkad and Regional Agricultural Research Station, Pilicode during 2016 -18. Nutrient stick is a complete fertilizer composite that is formulated in solid form. It contains ten essential nutrients. The formulation technique was standardized after trying a series of combination by mixing the finely powdered fertilizer materials. The stick was evaluated in laboratory for dissolution pattern and found completely dissolving in water within two days and in soil solution within three weeks. The field experiment was carried out in randomized block design with nine treatments and three replications. The treatment combinations were, KAU POP with conventional irrigation practices (T1), drip irrigation + soil test based nutrient application as per modified KAU POP (T2), drip irrigation + nutrient stick (T3), 75 per cent of NPK as per KAU POP through fertigation + 25 per cent nutrient stick (T4), 50 per cent of NPK as per KAU POP through fertigation + 50 per cent nutrient stick (T5), T2 + potassium silicate spray @ 0.25 per cent (T6), T3 + potassium silicate spray @ 0.25 per cent (T7), T4 + potassium silicate spray @ 0.25 per cent (T8), T5 + potassium silicate spray @ 0.25 per cent (T9) The application of different treatments showed significant improvement in biometric characters, yield and yield attributes of the oriental pickling melon crop. The shortest duration for days to harvest of the crop was recorded (59.6 days) for the treatment combination of 75 per cent of NPK as per KAU POP through fertigation + 25 per cent nutrient applied as stick. More number of fruits per plants and highest total fruit yield per plot were observed in the treatment with drip irrigation + nutrient stick + potassium silicate given as 0.25 per cent foliar spray. Application of 75 per cent of NPK as per KAU POP through fertigation + 25 per cent nutrient stick along with potassium silicate spray at a rate of 0.25 per cent solution showed highest fruit weight and fruit length. The treatments which included application of silicon as foliar spray recorded maximum shelf life of fruits, extending to six months after harvest. The spray of silicon as potassium silicate was given covering the complete foliage of the crop. The effect of treatments on soil nutrient status were studied at 45 DAS and at harvest stage, showed that N, P, K, Ca, Mg, Fe, Mn, Cu and Si status of the soil varied significantly with treatment application, while pH, EC, S, Zn and B content of soil showed no significant variation among the treatments. Highest available nutrients in the soil at 45 DAS and at harvest were recorded with application of 75 per cent of NPK as per KAU POP through fertigation along with 25 per cent nutrient stick. The leaf nutrient concentrations of oriental pickling melon at harvest were also analysed and it was noticed that, there was significant influence with respect to treatments receiving all the ten nutrients as compared to package of practices recommendations alone. The results obtained from this experiment clearly indicate that application of fertilizers through nutrient stick along with foliar silicon was found to be highly effective. In fertigation treatments residual available soil nutrients were higher as compared to fertilizer through nutrient stick, indicating better efficiency of nutrient sticks.
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    Influence of nutrition and varieties on yield and qualities of coconut inflorescence sap
    (Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, 2017) Raghu, R S; Biju Joseph