By Roger G. Petersen
This article presents statistical and biometrical approaches for designing, carrying out, reading and examining box experiments. It addresses an important study themes in agriculture, together with agronomy, breeding and pasture trials; farming structures learn; and intercropping examine.
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Organic matter or nutrient solubilization in the system could be determined with a larger sample size, and the prediction of energy values might thereby be improved. , NAKAUE, HS. H. (1981). Poult. , 60, 225 BOLTON, w. (1960). Analyst, 85, 189 BOLTON, w. (1962). Proc. G. J. (1970). Proc. Can. Fed. Biol. J. M. (1956). / . Sei. Fd Agric, 7, 45 CHUDY, A. and SCHIEMANN, R. (1971). In Energetische Futterbewertung und Energienormen, p. 168. Eds R. Schiemann, K. Nehring, L. Hoffman, W. Jentsch and A. Chudy.
Proc. Can. Fed. Biol. J. M. (1956). / . Sei. Fd Agric, 7, 45 CHUDY, A. and SCHIEMANN, R. (1971). In Energetische Futterbewertung und Energienormen, p. 168. Eds R. Schiemann, K. Nehring, L. Hoffman, W. Jentsch and A. Chudy. C. and BAYLEY, HS. (1977a). Can. J. Anim. D. S. (1977b). Can. J. Anim. M. L. (1980). Poult. ScL, 59, 1941 DAVIDSON, J. and GRAHAM, S. (1981). J. agric. , 96, 221 FARRELL, DJ. (1978). Br. Poult. , 19, 303 FARRELL, DJ. (1981). Wld's Poult. Sei. , 37, 72 FISHER, C. (1982). Energy Values of Compound Poultry Feeds.
1(a) shows the partition of the dry matter between InM, DOM and non-DOM. It can be seen that there is little variation in the proportions of inorganic and organic matter, and the design therefore assumes that both water and ash act simply as diluents and do not influence the utilization of energy from other sources. Some recent evidence on the effect of acid:base ratios on ME values (McNab and Dewar, 1981; Nelson et aL, 1981) suggests that this assumption might require reconsideration. 1(b) shows the diet space for digestible fat, protein and carbohydrate (NFE), the major determinants of ME.
Agricultural Field Experiments by Roger G. Petersen