The Bradyrhizobium uaiense strain UFLA 03-164T enhanced yield performance of cowpea in soils with low or high phosphorus content

The objective of this study was to evaluate the agronomic efficiency of rhizobia strains already approved or in the selection stage for cowpea, in the Recôncavo da Bahia region, Brazil. Two field experiments were performed in the municipalities of Cruz das Almas and Maragogipe, Bahia, Brazil. A randomized block design was used with seven nitrogen sources and four replicates. Nitrogen sources consisted of the strains UFRB FA51B1, UFRB BA72C2-1, UFLA 03-164T, UFLA 03-84, INPA 03-11B, and two controls without inoculation, one with mineral nitrogen and another without. All the strains nodulated cowpea. The efficiency of the strains was determined by the number of nodules, nodule dry matter, total dry matter, grain yield, nitrogen accumulation in shoots and grain, and relative efficiency. The strain UFLA 03-164T can be recommended for biomass production, green manure, and promotion of grain yields in both soils. In Maragogipe, the UFLA 03-84 and INPA 03-11B strains can be recommended for biomass production, green manure, and promotion of grain yields. The UFLA 03-164T strain showed great potential to promote and grain yield in the two municipalities studied. The strain INPA 03-11B can be recommended for Maragogipe soil. UFLA 03-84 can also be recommended to increase grain yield in Cruz das Almas.

Seedlings of cassava varieties are responsive to organic fertilization / Mudas de variedades de mandioca são responsivas à adubação orgânica

No Brasil, já existe recomendação para produção de manivas semente de mandioca indicadas para mudas produzidas a partir da micropropagação, podendo ser estendida para a produção de mudas obtidas de hastes derivadas de plantas sadias, para evitar a disseminação de doenças. Assim, há necessidade da determinação de substratos de cultivo de fácil aquisição e que estimulem o crescimento das mudas, tanto para redução do tempo em viveiro, como também para reduzir os custos de produção das mudas. O objetivo deste trabalho foi avaliar o efeito do adubo orgânico elaborado a partir de estercos bovinos e caprino, além de resíduos de podas de árvores para a produção de mudas de três variedades de mandioca. As parcelas foram dispostas em delineamento experimental inteiramente casualizado, com seis repetições. Os tratamentos constaram de três genótipos de mandioca (BRS Formosa, BRS Tapioqueira e BRS Kiriris) e cinco proporções de adubo orgânico: solo (0:100, 20:80, 40:60, 60:40 e 80:20). As avaliações foram realizadas aos 30 e 45 dias após o plantio (DAP). Houve efeitos isolados para massa seca da parte aérea, massa seca total, área foliar e número de folhas. Interação para comprimento de raiz, índice de clorofila a e total, massa seca da raiz e relação entre MSPA/MSR aos 45 DAP. O adubo orgânico estimulou o crescimento inicial das mudas de mandioca nas três variedades estudadas na proporção de 50% de adubo orgânico e 50% de Latossolo. As variedades BRS Formosa e BRS Kiriris apresentaram os maiores Índices de Qualidade de Dickson. Os genótipos respondem eficientemente a adubação orgânica e podem ser propagados nesses substratos de cultivo de fácil aquisição.(AU)

In Brazil, there is already a recommendation for the production of cassava seed-cuttings for the production of seedlings originated from micropropagation, which may be extended for the production of seedlings obtained from cuttings from healthy plant stems, in order to avoid the spread of diseases. Therefore, it is essential to establish adequate cultivation substrates of easy acquisition which may stimulate the growth of seedlings, both to reduce the nursery period, as well as the seedlings production costs. The objective of this work was to evaluate the effect of organic fertilizers made from bovine and goat manures, and tree pruning residues, to produce seedlings of three cassava varieties. The plots were set in a completely randomized design, with six replicates. The treatments consisted of three cassava genotypes (BRS Formosa, BRS Tapioqueira and BRS Kiriris) and five proportions of organic fertilizer: soil (0: 100, 20:80, 40:60, 60:40 and 80:20). The evaluations were performed 30 and 45 days after planting (DAP). There were isolated effects for shoot dry mass, total dry mass, leaf area and number of leaves. Interactions were verified for root length, chlorophyll a and total chlorophyll index, root dry mass and shoot dry mas/root dry mass ratio 45 DAP. The organic fertilizer stimulated the initial growth of cassava seedlings in the three varieties studied in the proportion of 50% of organic fertilizer and 50% of Latosol. Varieties BRS Formosa and BRS Kiriris showed the highest Dickson Quality Scores. Genotypes reacted efficiently to organic fertilization and can be propagated on these easily acquisition cultivation substrates.(AU)

Seedlings of cassava varieties are responsive to organic fertilization / Mudas de variedades de mandioca são responsivas à adubação orgânica

No Brasil, já existe recomendação para produção de manivas semente de mandioca indicadas para mudas produzidas a partir da micropropagação, podendo ser estendida para a produção de mudas obtidas de hastes derivadas de plantas sadias, para evitar a disseminação de doenças. Assim, há necessidade da determinação de substratos de cultivo de fácil aquisição e que estimulem o crescimento das mudas, tanto para redução do tempo em viveiro, como também para reduzir os custos de produção das mudas. O objetivo deste trabalho foi avaliar o efeito do adubo orgânico elaborado a partir de estercos bovinos e caprino, além de resíduos de podas de árvores para a produção de mudas de três variedades de mandioca. As parcelas foram dispostas em delineamento experimental inteiramente casualizado, com seis repetições. Os tratamentos constaram de três genótipos de mandioca (BRS Formosa, BRS Tapioqueira e BRS Kiriris) e cinco proporções de adubo orgânico: solo (0:100, 20:80, 40:60, 60:40 e 80:20). As avaliações foram realizadas aos 30 e 45 dias após o plantio (DAP). Houve efeitos isolados para massa seca da parte aérea, massa seca total, área foliar e número de folhas. Interação para comprimento de raiz, índice de clorofila a e total, massa seca da raiz e relação entre MSPA/MSR aos 45 DAP. O adubo orgânico estimulou o crescimento inicial das mudas de mandioca nas três variedades estudadas na proporção de 50% de adubo orgânico e 50% de Latossolo. As variedades BRS Formosa e BRS Kiriris apresentaram os maiores Índices de Qualidade de Dickson. Os genótipos respondem eficientemente a adubação orgânica e podem ser propagados nesses substratos de cultivo de fácil aquisição.

In Brazil, there is already a recommendation for the production of cassava seed-cuttings for the production of seedlings originated from micropropagation, which may be extended for the production of seedlings obtained from cuttings from healthy plant stems, in order to avoid the spread of diseases. Therefore, it is essential to establish adequate cultivation substrates of easy acquisition which may stimulate the growth of seedlings, both to reduce the nursery period, as well as the seedling’s production costs. The objective of this work was to evaluate the effect of organic fertilizers made from bovine and goat manures, and tree pruning residues, to produce seedlings of three cassava varieties. The plots were set in a completely randomized design, with six replicates. The treatments consisted of three cassava genotypes (BRS Formosa, BRS Tapioqueira and BRS Kiriris) and five proportions of organic fertilizer: soil (0: 100, 20:80, 40:60, 60:40 and 80:20). The evaluations were performed 30 and 45 days after planting (DAP). There were isolated effects for shoot dry mass, total dry mass, leaf area and number of leaves. Interactions were verified for root length, chlorophyll a and total chlorophyll index, root dry mass and shoot dry mas/root dry mass ratio 45 DAP. The organic fertilizer stimulated the initial growth of cassava seedlings in the three varieties studied in the proportion of 50% of organic fertilizer and 50% of Latosol. Varieties BRS Formosa and BRS Kiriris showed the highest Dickson Quality Scores. Genotypes reacted efficiently to organic fertilization and can be propagated on these easily acquisition cultivation substrates.