The objective of this study was to evaluate the effects of strains of Azospirillum brasilense, Pseudomonas fluorescens and Rhizobium tropici on the shoot dry weight (SDW) and root dry weight (RDW) yield, N uptake and nutritive value of ‘Mavuno’ grass inoculated with plant growth-promoting bacteria. We evaluated the effects of inoculation with the Ab-V5 and Ab-V6 strains of Azospirillum brasilense and Pseudomonas fluorescens or co-inoculation with Rhizobium tropici and Ab-V6, with and without nitrogen (N) application, as well as re-inoculations. The growth promoting bacteria + N promoted increases in SDW and RDW yield, tillers dry weight, relative chlorophyll index and N uptake. There were no effects of re-inoculation by Azospirillum brasilense, Pseudomonas fluorescens and Rhizobium tropici on nutrition, nutritive value and SDW and RDW yield, demonstrating that this technique still needs further studies with ‘Mavuno’ grass in the form and the correct period to be performed.

Azospirillum inoculation of 'Marandu' palisade grass seeds: effects on forage production and nutritional status

The objectives of this study were to evaluate morphogenetic characteristics and tillering dynamics in Tanzania grass fertilized and non-fertilized with nitrogen, under intermittent grazing, in the spring and the summer. The main plots were composed of four nitrogen rates (0, 100, 200 and 300 kg/ha) and the subplots were growth seasons: spring (October, November and December) and summer (January, February and March). The experimental design was of randomized block with plots subdivided by time (seasons of the year) and four replications. Urea was used as nitrogen supply and was divided into two applications: one in the spring and another in the summer. The experimental units fertilized with N rates of 200 and 300 kg/ha showed six cycles of pasture, with an average of 27 days of pasture interval, while the treatments with no fertilization and 100 kg/ha of N showed only four and five cycles of pasture, respectively. Leaf elongation rate (LER) and the leaf appearance rate (LAR) increased linearly with increasing of N rates. The greatest population density occurred in summer with the higher nitrogen rates. The treatment without N fertilization showed the lowest growth of tiller population, while the other treatments exhibited growth rates above 50% when compared with non-fertilized samples. Nitrogen rates significantly affect the leaf appearance rate and the leaf elongation rate, as well as the number of live leaves in plants of Tanzania grass in both spring and summer

Root system and root and stem base organic reserves of pasture Tanzania grass fertilizer with nitrogen under grazing

Avaliaram-se a produção e o valor nutritivo da forragem das seguintes espécies: Cynodon spp (Tifton 68, Tifton 78, Tifton 85, Florakirk, Florico e Florona), Paspalum notatum (Tifton 9), Brachiaria brizantha (Marandu) e Panicum maximum (Tanzânia) na região de Araçatuba, Estado de São Paulo. Utilizou-se o delineamento de blocos completos casualizados com parcelas subdivididas e quatro repetições. A produção de massa seca (PMS) acumulada não diferiu entre as espécies forrageiras. Teores mais elevados de PB (125 a 145 g . kg^-1) foram observados nos cultivares do gênero Cynodon na estação das águas. Teores mais elevados de FDN foram observados nos capins dos gêneros Cynodon e Paspalum na estação das águas e seca. Os valores de DIVMS variaram de 436 a 699 g . kg^-1, sendo o menor valor observado no capim-Tifton 9, na estação das águas, e o maior valor no capim-Tifton 68, na época da seca. A diferença estacional na PMS foi mais pronunciada no capim-Tifton 85, que apresentou somente 9% da produção anual na estação seca