Studies on increased and improved storage of BIO-N for rice and corn (January 1998-1999)
2000
Garcia, M.U. | Padilla, V.M.
The population of about 10 sup 6 to 10 sup 7 cells per seed were maintained until the second week and slightly increased at 4 weeks of storage. The cell population per seed at 6 weeks until the 24th week of storage gave the highest survival at 1:1 ratio compared with 1:1/2 and 1/2:1 ratio. The 1:1 ratio of inoculants to sticker have better survival in 16 weeks of storage. The population of 10 sup 5 cells per seed of BSs 8 inoculation can be maintained from 0 to 12 weeks and continue to decrease until the 24th week of storage. Preinoculated seeds of corn with BSs 8 with any of the different inoculants: sticker ratio can be stored for a period of 12 weeks. The effect of dilution on the survival of BSs 202 showed that 100% concentration gave the most stable cell population ranging from 107 to 108 cells per gram inoculants. Dobereiner's medium as diluents indicated that cells of BSs 202 multiplied in the presence of nutrients supplied by the medium when incorporated to the inoculants carrier provided the supply of nutrients for its survival. The survival of BSs 202 inoculant for rice in different carriers (coir dust, soil plus charcoal), sterilization and broth inoculums dosage incorporated to the carriers. The results indicated that the bacterial population of BSs 202 in either sterile coir dust incorporated with full dosage of broth inoculums or soil plus charcoal carriers were comparable with the other treatment. However, sterile coir dust with full dosage gave the best result on survival of BSs 202. An assessment of the interaction of BIO-N inoculation and three IPB [Institute of Plant Breeding, College, Laguna, Philippines] corn hybrids at their stage of development showed that the inoculation with BIO-N combined with either 1.5 or 3.0 grams of 17-17-17 fertilization did not affect shoot weight. Fertilization coupled with BIO-N gave better shoot weight compared with the other treatments. Root weight was best in unfertilized BIO-N inoculated plants. Varietal 913 IPM 99 IPB 929. There is possibility of improving the yield of hybrid corn under minimal fertilizer input through screening for more responsive corn variety is identified, the poor farmers, who use to shun the use of corn hybrids because of prohibitive fertilizer requirement, can start using hybrid in corn production. It is therefore recommended that screening for genotype x inoculants effectiveness be pursued to pave the way to a more productive corn growing in the country. The performance of PSBRC 12 rice variety significantly increase the grain fresh weight of rice fertilized with 50 kg N/ha coupled with solid inoculation. Liquid inoculation improved the grain fresh weight of rice. Fertilization of rice with either 50 or 100 kg N/ha significantly improved the fresh weight of rice grain compared with the unfertilized plants. These results indicated that with high level of fertilization, BSs 202 inoculant for rice will not be effective. The significant increase in the fresh weight of rice grain with 50 kg N/ha fertilization coupled with solid inoculation can be recommended considering the significant increase when compared with the unfertilized control.
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