Determination of Botanical Composition of Two-Component Forage Mixtures

Tanner, J. W.; Gamble, E. E.; Tossell, W. E.

doi:10.4141/cjps60-033

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…For every comparison, the precision of the visual estimation method was greater than the precision of hand separations. These results agree with the findings of Tanner et al ( 4), who reported that visual estimation of alfalfa in timothyalfalfa mixtures was consistently more precise than hand separations. No consistent difference appeared in degree of…”

Section: Variability Within Methodssupporting

confidence: 93%

“…Procedures of statistical analysis were similar to those used by Tanner et al ( 4), including the arcsin transformation of all legume percentage figures. Major sources of variation were located through an overall analysis of variance.…”

Section: Methodsmentioning

confidence: 99%

“…S EVERAL recent publications ( 1,4,5) present reviews or citations of the voluminous literature concerning methods for determining botanical composition of forage mixtures.…”

mentioning

confidence: 99%

“…On the other hand, Tanner et al ( 4) reported that visual estimations of alfalfa percentage in standing timothy-alfalfa mixtures were consistently more precise than hand separation determinations. While the two methods were highly correlated, bias appeared in the visual estimations of some treatments.…”

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confidence: 99%

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Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures¹

Marten¹

1964

Agronomy Journal

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Synopsis In 3 harvests of 20 legume‐grass mixtures in 1962, the visual method consistently overestimated legume percentage in the spring harvest, but gave varying response in the aftermath harvests. However, significant correlations with each mixture and a highly significant overall correlation (r = 0.798) occurred between visual estimates and hand separation determinations of percentage legume. While visual estimates were biased in varying degrees with different species and varieties, the visual method had greater precision (less random error).

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Section: Variability Within Methodssupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

“…S EVERAL recent publications ( 1,4,5) present reviews or citations of the voluminous literature concerning methods for determining botanical composition of forage mixtures.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures¹

Marten¹

1964

Agronomy Journal

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“…A number of indirect methods for estimating botanical composition of mixtures of grasses and legumes have been developed. Some common methods are visual estimation (Marten, 1964;Tanner et al, 1966;Tiwari et al, 1963), point quadrat methods (Leasure, 1949;VanKeuren and Ahlgren, 1957), and the dry-weight rank method (Mannetje and Haydock, 1963;Walker, 1970). Each of these methods has advantages and disadvantages.…”

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confidence: 99%

Indirect Estimation of Botanical Composition of Alfalfa‐Smooth Bromegrass Mixtures

1990

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Botanical composition of grass‐legume mixtures greatly influences the productivity and quality of the sward and is therefore an important variable in many agronomic studies. Four indirect methods of estimating the botanical composition of mixed swards of alfalfa (Medicago sativa L.) and smooth bromegrass (Bromus inermis Leyss.) were evaluated to determine their relative efficacy. The methods were the constituent differential method using either neutral detergent fiber (NDF) concentration or crude protein (CP) concentration as variables, a modified constituent differential method where NDF and CP concentrations were used simultaneously as variables, and near infrared reflectance spectroscopy (NIRS). Mean deviations of predicted alfalfa percentages from known values were lowest for NIRS at all stages of maturity and averaged 1.5 percentage units. Of the constituent differential procedures, NDF was the most reliable variable for predicting alfalfa percentage over all maturities with deviations averaging 2.9 percentage units. Based upon the results of this study, NIRS would be the preferred method for estimating botanical composition of grass‐legume mixtures; however, in cases where NIRS is unavailable or inappropriate, the constituent differential method using NDF as a single variable would be an acceptable alternative.

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The Use of Cattle and Sheep for Evaluating Grass and Legume Swards, a Comparison of Methods

Calder

1970

Grass and Forage Science

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A comparison was made of the effects of grazing with cattie and sheep separateiy hy two methods, continuous and rotationai on two forage mixtures. The two mixtures were timothy {Phleum pratense L.) with iadino white ciover (Trifolium repens L.); and hrome grass (Bromus inermis Leyss) witii aifalfa {Medicago sativa L.). The rotationai system of grazing created different effects on sward composition from those caused hy the continuous grazing system. The legumes survived hetter under rotational than continuous grazing. Sheep, under hoth grazing systems, grazed more severeiy than cattie; they defoliated the ieaf portion of the plants and ieft more stem standing than did the cattle. Protein of the sward increased witb the leaf portion, but in vitro digestibility was not altered as leaf to stem ratios changed. Although the gross effects of sheep and cattle were similar, there were differences in detail in the effect on these swards.

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Determination of Botanical Composition of Two-Component Forage Mixtures

Abstract: A comparative srucly was made in 19i8 of the visual estimat'io-n and .nr"a ""piirttotr merhods of dctermining botanical_ composition of two-;;G;il];."g" -ltr"i.r. The results-indicated that there were.posirive rt"ihl""i *ri""lrtiont berween

Cited by 4 publications

References 2 publications

Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures¹

Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures¹

Indirect Estimation of Botanical Composition of Alfalfa‐Smooth Bromegrass Mixtures

The Use of Cattle and Sheep for Evaluating Grass and Legume Swards, a Comparison of Methods

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Determination of Botanical Composition of Two-Component Forage Mixtures

Abstract: A comparative srucly was made in 19i8 of the visual estimat'io-n and .nr"a ""piirttotr merhods of dctermining botanical_ composition of two-;;G;il];."g" -ltr"i.r. The results-indicated that there were.posirive rt"ihl""i *ri""lrtiont berween

Cited by 4 publications

References 2 publications

Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures1

Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures1

Indirect Estimation of Botanical Composition of Alfalfa‐Smooth Bromegrass Mixtures

The Use of Cattle and Sheep for Evaluating Grass and Legume Swards, a Comparison of Methods

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About

Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures¹

Visual Estimation of Botanical Composition in Simple Legume‐Grass Mixtures¹