Avaliação da rebrota do milheto em função da altura de corte e interceptação luminosa
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Data
2014-03-07
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Universidade Federal de Goiás
Resumo
The forage millet is used during certain time of the year is characterized as annual
crop from harvest of easy implementation and good nutritional value, so no need
to study the response of the regrowth of the culture parameters based on more
refined handling that may guide decision practices in relation to heights of entry
and exit decisions. Therefore, the aim of this study was to evaluate the regrowth of
millet in four residual height of cutting (RHC) associated with two light interception
(LI) 80 and 90% and recommend how best RHC and LI in forage millet, from
results of agronomic, morphological and qualitative conditions of Goiás. Variables
the field experiment was conducted at the School of Agronomy and Food
Engineering of UFG. The experimental period regarding fieldwork was conducted
between December 2012 and April 2013. Four cutting heights with two light traps
were evaluated. The experiment was performed with 4x2 factorial (cutting heights
x light interception) in a randomized block design with eight treatments and four
replicates totaling 32 experimental units. The cuts were made as the sward hunt
80 and 90% of radiation in their RHC's. Outcome variables related to agronomic
evaluations were total dry matter production (TDMP) in kg ha-1; DM percentage of
the whole plant and components (leaf blade, stem, panicle and senescent
materials); heights of entry; count tillers and cutting intervals. The morphological
variables were the proportion of morphological components, leaf/stem ratio (L/S),
direct and indirect index of leaf area (DILA and IILA). From the material collected
separately determined the following bromatological compositions of the whole
plant and morphological components: dry matter (DM), mineral matter (MM), crude
protein (CP), ether extract (EE), acid detergent fiber (ADF ), neutral detergent fiber
(NDF), cellulose (CEL), hemicellulose (HEM), lignin (LIG), non-fiber carbohydrates
(NFC) and total digestible nutrients (TDN). Was no difference in cumulative
average production of millet regrowth between IL's 80 and 90%. The cumulative
average production of LI regrowth of 80% was 2.44 T DM.ha-1 and LI 90% was
4.51 T DM.ha-1. The cutting interval with IL showed a 90% average difference
exceeding 11 days compared to 80% LI. In relation to morphological composition,
the overall average and the average standard error of the IL's with 80 and 90% for
the variable ratio L/S were respectively 0.90 ± 0.04 and 0.61 ± 0.03. Regarding the
chemical composition, the average percentage of the whole plant in MS IL's 80
and 90 was 14.13% and 17% respectively. The component of the plant that has
the highest average percentage of DM is the panicle. Reached 32% of DM in the
ACR of 10 cm with 90% LI. Difference (p <0.05) for the percentage of CP between
the mean LI's 80 and 90%, with 19.11% and 16.28% respectively. The entry height
and recommended as a practical parameter management for the use of regrowth
for grazing residue are 80 and 30 cm respectively, based on the RHC x LI factors.
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RIBEIRO, R. E. P. Avaliação da rebrota do milheto em função da altura de corte e interceptação luminosa. 2014. 73 f. Dissertação (Mestrado em Ciência Animal)–Universidade Federal de Goiás, Goiânia, 2014.