1. KAUTIR (Kerala Agricultural University Theses Information and Retrieval)
Permanent URI for this communityhttp://localhost:4000/handle/123456789/1
Browse
7 results
Search Results
Item Potash nutrition of rice with regard to the effect of Calcium, Magnesium and Silicon(Division of Chemistry, Agricultural College & Research Institute, Vellayani, 1966) Usha, C; Verghese, E JThe study of potash nutrition of rice for maximum economic yields of grain and straw of high quality has not so far received adequate attention. In recent years, however, the use of potash in rice production has made remarkable progress in Japan and in India. But sufficient data are not yet available with regard to the need for potash manuring of Rice in Kerala. It is well known that rice soils of Kerala are very poor in lime status due to high rainfall obtained in the State. It has been found that liming affects the available potash contents in the soils.Item Studies on the effect of silicate fertilization on the uptake of nutrients by rice plant at different stages of growth(Division of Agricultural Chemistry, Agricultural College and Research Institute, Vellayani, 1965) Sadanandan, A K; Verghese, E JItem Integrated nutrient approach on productivity enhancement of rice in oxyaquic fluent soils of Northern Kerala(Department of Agronomy, College of Agriculture, Padannakkad,Kasaragod, 2018) Chanchala, A; Bridgit, T KThe experiment entitled “Integrated nutrient approach on productivity enhancement of rice in oxyaquic fluent soils of Northern Kerala” was conducted to study the effect of organic manures along with micronutrient mixtures on growth, yield, pest and disease incidence, nutrient uptake and economics of wetland rice in farmer’s field during virippu season 2017. The experiment was laid out in randomized block design with 12 treatments and 3 replications. The treatments were T1 - Farmer’s practice (FYM 5 t ha -1 + 18:18:18), T2 - Fertilizer recommendation on the STCR basis (75.6: 57.6: 37.35 kg ha -1 NPK), T3 - POP Recommendation of KAU (90:45:45 kg ha-1 NPK ), T4 - FYM (5t ha-1) + Neem cake (400 kg ha-1) + Groundnut cake (400 kg ha -1), T5 - T3 + Ayar (500 kg ha-1 as basal dose), T6 - T3 + Sampoorna (5g l-1 at 1-2 days before transplanting and 10 g l-1 at 50 DAT as foliar spray respectively), T7 - T4 + Ayar (500 kg ha-1 as basal dose), T8 - T4 + Sampoorna (5g l-1 at 1-2 days before transplanting and 10 g l-1 and at 50 DAT as foliar spray respectively), T9 - T5 + Si (100 kg ha-1 as calcium silicate), T10 - T6 + Si (100 kg ha-1 as calcium silicate), T11 - T7 + Si (100 kg ha-1 as calcium silicate) and T12 - T8 + Si (100 kg ha-1 as calcium silicate). The available N, P and K status of the experimental field ranged from low to medium and the secondary and micronutrients were in the sufficiency level. All the treatments were applied as per the technical programme. The results of the experiment showed that the growth and yield attributes such as plant height and number of tillers hill-1, number of panicles hill-1, filled grains panicle-1, test weight and lowest number of chaffy grains were significantly influenced by application of POP recommendation of KAU along with micronutrient mixtures viz. Sampoorna and Ayar. The treatment T9 (T5 + Si) recorded maximum grain yield which was on par with T6 (T3 + Sampoorna). Straw yield was maximum in T5 (T3 + Ayar) and was on par with T6. Higher harvest index was recorded in treatment T9 (T5 + Si). At harvest, the available N and P status of the soil were increased whereas the available K was decreased when compared to the initial soil nutrient status. Application of FYM + Neem cake + Groundnut cake along with Sampoorna recorded higher soil available N and application of fertilizers based on POP recommendation of KAU along with Ayar recorded maximum soil available P content. Plant nutrient content viz. N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and Si of both shoot and root were analyzed at maximum tillering, PI stage and at harvest. In the shoot, all the nutrients showed a declining trend from maximum tillering to PI except sulphur. The content of Fe showed sharp decrease from maximum tillering to harvest stage. The total uptake of nutrients showed a significant difference among treatments. Phosphorus uptake was maximum in treatment T10 and T6 recorded maximum K uptake. The treatment T9 recorded maximum uptake of nutrients such as Ca, Zn and Mn. T 5 recorded maximum Mg uptake. Application of FYM + Neem cake + Groundnut cake along with Sampoorna and silicon reduced the uptake of Fe. Correlation study revealed that plant nutrient content such as P, Ca, Mg, Cu and Si showed a positive relationship with yield at different critical growth stages. The treatment with POP Recommendation of KAU along with Sampoorna (T6) recorded maximum yield, gross return, net return and B:C ratio whereas, application of POP Recommendation of KAU along with Ayar and Si were also equally good with yield and ease of application. In general, the integrated use of organic and inorganic sources of nutrients along with secondary, micronutrients and Si not only increase the growth parameters and yield attributes but also increase the soil nutrient level and economics of wetland rice cultivation.Item Flux and dynamics of iron and aluminium in wetlands of Kuttanad and its management for rice (Oryza sativa L.)(Department of Soil Science and Agricultural Chemistry, College of Agriculture, Padannakkad, 2017) Ebimol, N L; Suresh, P RItem Molecular Characterization of sweet potato feathery mottle virus(Department of Plant Biotechnology, College of Agriculture, Vellayani, 2017) Ashna, N K; Makeshkumar, TA study on “Molecular characterization of Sweet potato feathery mottle virus” was conducted at the ICAR- Central Tuber Crop Research Institute, Sreekariyam, Thiruvananthapuram during 2016-2017. During the study 45 accessions of sweet potato from different fields of ICAR- CTCRI were selected and different symptoms of Sweet potato feathery mottle virus infection were recorded. The study reveals that the rate of infection is still prevailing in Kerala having high symptom severity due to combination with other potyviruses and increased aggressiveness as compared to earlier years because of the presence to different strains. Total RNA was isolated from all samples and used for RT-PCR analysis by degenerate primers for potyviruses and specific primers for SPFMV to differentially identify the presence of SPFMV. From the 45, five were confirmed as SPFMV positive. Among this amplified products obtained from sample SH710 was sequenced. From the 8 clones sequenced 3 different isolates of SPFMV is obtained, Sweet potato feathery mottle virus isolate SPFMV-O-Arg polyprotein gene (NCBI ID: KF386013.1) from Argentina, Sweet potato feathery mottle virus isolate CW137 (NCBI ID: KP115608.1) from Korean and Sweet potato feathery mottle virus isolate Shanxi2 coat protein gene (NCBI ID: HQ844123.1) from China, these are further belongs to broad class of Ordinary and Russet crack and East African. It further showed the possibility of presence of RC-strain O-strain and EA-strain in Kerala. To identify the phylogenetic relationship of the sequenced samples with that of available accessions, dendrograms were made using MEGA 7.0.26 software and the tree showed that sequences has variability eventhough lies within the group. By restriction analysis and sequence analysis, variability was recorded within SPFMV in Trivandrum.Item Silicon nutrition for rice in iron toxic laterite soils of Kollam district(Department of Agronomy, College of Agriculture, Vellayani, 2017) Guntamukkala Babu Rao; Poornima Yadav, P IItem Silicon, boron and zinc nutrition of bitter gourd (Momordica charantia L.) var. preethi(Department of plant soil science and agricultural chemistry, Padannakkad, 2015) Mohammed, Shahid Salam C H; Suresh, P R