Whitney, A.S. (1974) Measurement of foliage height and its relationships to yields of two tropical forage grasses. Agronomy Journal, 66 (2). pp. 334-336.
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Abstract
Direct visual estimates of average foliage height based on a 28 x 28 cm sampling area could be made at a rate of 7.5 readings/minute using a new device which utilized a plastic fresnel lens. Foliage height was estimated (5 readings/plot) for kikuyugrass (Pennisetum clandestinum Hochst. ex. Chiov.) and pangola digitgrass (Digitaria decumbens Stent) swards which varied widely in yield due to different nitrogen and gibberellic acid treatments. Average foliage height explained 94% of the variation in dry matter yields in both cases, but the regression slope was different for the two grasses. Sampling error was low in relation to experimental error. The calculated number of samples required to estimate the mean foliage height was 8 to 9 samples/ plot for estimates ±2 cm and 4/plot for ^3 cm (P = 0.95). This approach appears especially promising for estimating forage growth rates where nondestructive sampling is desired and where swards are variable, i.e. as in grazed paddocks
| Item Type: | Article |
|---|---|
| Author Affiliation: | Hawaii Agricultural Experiment Station, Kula, Hawaii, USA |
| Subjects: | Plant Production Plant Production > Production Practices |
| Divisions: | Other Crops |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 15 Dec 2011 06:05 |
| Last Modified: | 15 Dec 2011 06:05 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/2839 |
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