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The Use of the grassmeter as a simplified method to estimate dry matter yield on annual self-reseeding medics and clovers

Franca, Antonello and Roggero, Pier Paolo and Porqueddu, Claudio and Caredda, Salvatore (2003) The Use of the grassmeter as a simplified method to estimate dry matter yield on annual self-reseeding medics and clovers. Italian Journal of Agronomy, Vol. 7 (2, parte 1), p. 103-110. ISSN 1125-4718. Article.

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Abstract

BACKGROUND. The grassmeter non-destructive method was used to estimate dry matter yield (DMY) of 24 annual self-reseeding legumes. The possibility was evaluated of using the grassmeter as an alternative to conventional destructive quadrats for large field plot experiments.
METHODS. The linear regressions between sward height measured by the grassmeter and DMY were analysed. Three types of regression equations were calculated: (i) ‘general’, a single equation including the three-year set of height/DMY pairs of data; (ii) ‘specific’, one regression equation for each species; (iii) ‘preliminary’, calculated from the data collected in the spring and autumn cuts of the first year.
RESULTS. The ‘general’ calibration gave a satisfactory estimate of DMY (R2=0.55). The ‘specific’ calibration was particularly accurate for Trifolium brachycalicynum “Osilo” (R2=0.88), T. squarrosum “Chilivani” (R2=0.81) and Medicago polymorpha “Circle Valley” (R2=0.81), but not for M. rugosa “Sapo” (R2=0.22) and “Paraponto” (R2=0.26). The ‘preliminary’ calibration, which was based only on the destructive assessment of DMY at the first cut, provided reliable estimates of DMY until the sward conditions, namely cover rate and weeds, were comparable to those of the calibration period. The coefficient of variation of the DMY estimate based on the grassmeter ‘general’ calibration was about 10% lower than that of the DMY measured with conventional quadrats.
CONCLUSIONS. Results suggest that the grassmeter could effectively replace destructive measurements for estimating the DMY of annual self-reseeding legumes, thus reducing labour requirements and number of samples to be processed, or increasing, when needed, the number of accessions to compare and hence the inference of the experiment.

Item Type:Article
ID Code:3593
Status:Published
Refereed:Yes
Uncontrolled Keywords:Annual medics, annual clovers, canopy height, grassmeter, dry matter yield
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/02 Agronomia e coltivazioni erbacee
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze agronomiche e genetica vegetale agraria
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto per il sistema produzione animale in ambiente Mediterraneo, Sassari
Publisher:Forum editrice udinese
ISSN:1125-4718
Copyright Holders:© Italian Society for Agronomy
Publisher Policy:Depositato per gentile concessione dell'Editore e della Società italiana di agronomia
Deposited On:10 Mar 2010 09:51

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