O objetivo da obra é fornecer instruções, de maneira simples e prática, para correção e adubação de pastagens tropicais. A elaboração deste livro é uma das iniciativas de ampliação no acesso à informação e transferência de tecnologia, desenvolvida pelo Grupo de Estudos em Forragicultura e Pastagens (GEFEP) da Faculdade de Zootecnia e Engenharia de Alimentos (FZEA-USP). Os autores esperam que essa iniciativa possa colaborar para o desenvolvimento dos sistemas produtivos na região, contribuir para a recuperação das pastagens e, ainda, oportunizar melhorias em produtividade e persistência das gramíneas tropicais.
ABSTRACT. Nitrogen fertilization ensures productivity and persistency of pastures, but may be expensive. Perennial forage peanut, becomes an interesting alternative for N supply. Little is known about its use under grazing. The objective of this study was to evaluate regrowth process of forage peanut using an experimental protocol analogous to tropical forage grasses under rotational grazing. Treatments corresponded to two pre-(95% and maximum canopy light interception -LI 95% and LI Max ) and two postgrazing (post-grazing heights of 40 and 60% of pre-grazing height) conditions, in a 2x2 factorial arrangement in a randomized complete block design (n = 4). Targets of LI pre-grazing affected pregrazing height and LI post-grazing. The residual sward LAI did not vary, resulting in similar grazing interval. Greater rates and total herbage accumulation were recorded for LI Max target, consequence of the greater accumulation of stolons at the lower strata of the swards. Greater percentage of leaflets was recorded for the LI 95% target. Given the stoloniferous growth habit of forage peanut, stolon accumulation in the lower strata of the sward do not represent a limitation to leaf accumulation and morphological composition. The greater pre-grazing sward height associated with the LI Max target facilitate herbage prehension and intake, further investigation is needed.Keywords: intermittent stocking, sward structure, pre-grazing height, botanical/morphological composition, grazing management.Estrutura do dossel, interceptação de luz e acúmulo de forragem em amendoim-forrageiro cv. Belmonte submetido a estratégias de pastejo rotativo RESUMO. A adubação nitrogenada assegura produtividade e persistência de pastagens, mas pode ser onerosa. O amendoim forrageiro é alternativa, porém são escassas informações sobre seu manejo sob pastejo. Objetivou-se avaliar o processo de rebrotação do amendoim forrageiro, utilizando procedimento análogo ao utilizado para gramíneas tropicais sob pastejo rotativo. Os tratamentos corresponderam a combinações entre duas condições pré-pastejo (95% e máxima interceptação luminosa pelo dossel -IL 95% e IL Máx ) e duas condições pós-pastejo (alturas de 40 e 60% da altura pré-pastejo), segundo arranjo fatorial 2x2 e delineamento de blocos completos casualizados (n = 4). A IL pré-pastejo afetou a altura pré-pastejo e IL pós-pastejo. O IAF residual não variou entre tratamentos, resultando em intervalo entre pastejos semelhantes. Maior taxa e acúmulo de forragem foram verificados para a meta IL Máx , devido ao maior acúmulo de estolões nos estratos inferiores. Maior porcentagem de folíolos foi verificada para a meta IL 95% . Devido ao seu hábito de crescimento estolonífero, o acúmulo de estolões do amendoim forrageiro em estratos inferiores do dossel não comprometeu o acúmulo de folhas nos estratos superiores. Maior altura de entrada nos pastos manejados com a meta IL Máx pode representar maior facilidade de preensão e consumo de forragem, fato que necessita de estudos adicionais.Palavras-chave: lotação in...
The impacts of fertilization regimes and stubble heights in signal grass cv. Basilisk pastures were evaluated during latespring and summer in Brazil. Liming and N, P and K fertilization were applied to generate gradients in soil fertility tomaintain soil base saturations around 35%, 50% and 65%, increase soil P concentration and the proportion of K in soilcation exchange capacity, combined with two stubble heights of 10 and 15 cm. Herbage accumulation was not affectedby fertilization regimes and stubble height reaching 10 t/ha of dry matter during the growing season. Cutting at 10cm maximizes the leaf mass and leaf area index and decreases dead material mass without the need of high soil basesaturation and NPK fertilization rates to sustain plant growth. However, this stubble height required longer regrowthperiods to attain 95% of light interception (LI95%). A stubble height of 15 cm is preferred when short regrowth periods are required. The canopy height at the point of LI95% does not change with fertilization regimes, but the LI95% is reached at different canopy heights in late spring and summer in signal grass pastures. The adoption of a moderate fertilization regime is recommended as a strategy to obtain an equitable forage distribution between late spring and summer.
The perennial forage peanut is a stoloniferous, perennial tropical legume with potential for use in pastures. Based on the hypothesis that under intermittent stocking herbage accumulation would follow a similar pattern to that described for tropical forage grasses, the objective of this study was to evaluate canopy characteristics and herbage accumulation of forage peanut subjected to strategies of rotational grazing management. Treatments corresponded to all possible combinations of two grazing frequencies (regrowth interrupted at 95% and maximum canopy light interception – LI95% and LIMax) and two grazing severities (post-grazing canopy heights (CHs) equivalent to 40 and 60% of the pre-grazing heights). Treatments were imposed to experimental units during an adaptation period (from November 2014 to January 2015) and the subsequent experimental period lasted from February 2015 to April 2016, comprising two consecutive pasture growing seasons with no interruption between them (summer I to summer II). The pre-grazing targets of LI95% and LIMax corresponded to CHs of 13 and 18 cm, respectively. Forage peanut showed high grazing tolerance as pre-grazing leaf area index (except during summer I and autumn/winter), total herbage, and leaflet dry matter accumulation varied only with seasons. Higher rates of herbage production were recorded during summer I and summer II, followed by those during late and early spring and autumn/winter. Since there was no difference in the pattern of herbage accumulation between LI95% and LIMax and stolons predominated at the bottom of the canopies, forage peanut may be rotationally grazed with greater flexibility than most tropical forage grasses. Recommended pre-grazing CHs are within 13 and 18 cm, and post-grazing heights between 40 and 60% of the pre-grazing height.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.