SOME EXAMPLES OF EFFECT OF SOIL PHYSICAL CONDITIONS ON TRACTIVE EFFORT REQUIRED DURING PLOWING

[1] Selenium as a catalyst in the kjeldahl method as applied to soil and grass analysis [J]. JOURNAL OF AGRICULTURAL SCIENCE, 1936, 26 : 239 - 248

[2] AVERY BW, 1964, MEM SOIL SURV GT BRI

[3] EAGLE DJ, 29 HMSO TECHN B

[4] GREEN R, 1971, PRIVATE COMMUNICATIO

[5] HODGE CAH, 1966, MEM SOIL SURV GT BRI

[6] JARVIS MG, 1973, MEM SOIL SURV GT BRI

[7] Jongerius A., 1958, P INT S SOIL STRUCTU, P206

[8] LEWIS A. H., 1960, JOUR AGRIC SCI, V54, P310, DOI 10.1017/S0021859600021225

[9] LOW A. J., 1957, Outlook on Agriculture, V1, P155

[10] EFFECT OF CULTIVATION ON STRUCTURE AND OTHER PHYSICAL CHARACTERISTICS OF GRASSLAND AND ARABLE SOILS [J]. JOURNAL OF SOIL SCIENCE, 1972, 23 (04): : 363 - &

[1] Selenium as a catalyst in the kjeldahl method as applied to soil and grass analysis [J]. JOURNAL OF AGRICULTURAL SCIENCE, 1936, 26 : 239 - 248

[2] AVERY BW, 1964, MEM SOIL SURV GT BRI

[3] EAGLE DJ, 29 HMSO TECHN B

[4] GREEN R, 1971, PRIVATE COMMUNICATIO

[5] HODGE CAH, 1966, MEM SOIL SURV GT BRI

[6] JARVIS MG, 1973, MEM SOIL SURV GT BRI

[7] Jongerius A., 1958, P INT S SOIL STRUCTU, P206

[8] LEWIS A. H., 1960, JOUR AGRIC SCI, V54, P310, DOI 10.1017/S0021859600021225

[9] LOW A. J., 1957, Outlook on Agriculture, V1, P155

[10] EFFECT OF CULTIVATION ON STRUCTURE AND OTHER PHYSICAL CHARACTERISTICS OF GRASSLAND AND ARABLE SOILS [J]. JOURNAL OF SOIL SCIENCE, 1972, 23 (04): : 363 - &