Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
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The 11 references without a DOI — listed, not checked
no DOI — not checkedAl-Amoud A and Kay M G 1985 Monitoring root development under trickle irrigation. Proc. Third Int. Drip/Trickle Irrigation Congress. pp. 695–701. Fresno, CA.
no DOI — not checkedAnon. 1999 SPSS Base 10 User’s Guide. SPSS Inc., Chicago, IL, USA.
no DOI — not checkedBrown D A and Scott H D 1984 Dependence of crop growth and yield on root development and activity. In Roots, Nutrient and Water Influx and Plant Growth. Eds. S A Barber and D R Bouldin. pp. 101–135. ASA Special Publication 49.
no DOI — not checkedDoorenbos J and Kassam A H 1986 Yield response to water. FAO, Irrigation and Drainage Paper, 33, Rome.
no DOI — not checkedMajdi H, Smucker A J M and Persson H 1992 A comparison between minirhizotron and monolith sampling methods for measuring root growth of maize (Zea mays L.) Plant Soil 147, 127–134.
no DOI — not checkedRasquilha M P V G 1997 Dinâmica do enraizamento do milho (Zea mays L.) sob diferentes regimes hídricos com o recurso ao método do minirizoträo. Tese de Mestrado, Universidade de Evora, Évora.
no DOI — not checkedSmucker A J M, Mcburney S L and Srivastava A K 1982 Quantitative separation of roots from compacted soil profiles by the hydropneumatic elutriation system. Agron. J. 74, 500–503.
no DOI — not checkedUpchurch D R 1987 Conversion of minirhizotron-root intersections to root length density. In Minirhizotron Observation Tubes: Methods and Applications for Measuring Rhizosphere Dynamics. Ed. H M Taylor. pp. 51–65. ASA Special Publication 50.
no DOI — not checkedVan Noordwijk M 1993 Roots: length, biomass, production and mortality. Methods for root research. In Tropical Soil and Biology and Fertility, a Handbook of methods Eds. J M Anderson and J S I Ingram. pp 132–144. CAB International. Wallingford.
no DOI — not checkedVan Noordwijk M, Floris J and Jayer A 1985a Sampling schemes for estimating root density distribution in cropped fields. Neth. J. Agric. Sci. 33, 241–262.
no DOI — not checkedVos J and Groenwold J 1987 The relation between root growth along observation tubes and in bulk soil. In Minirhizotron Observation Tubes: Methods and Applications for Measuring Rhizosphere Dynamics. Ed. H M Taylor. pp. 39–49. ASA Special Publication 50.
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