References
- Koyama , T. and Chammek , C. 1971 . Soil‐Plant nutrition studies on Tropical rice (I). Studies on the varietal differences in absorbing P from soil low in available P (part 1) . Soil Sci. Plant Nutr. , 17 : 115 – 126 .
- Koyama , T. and Snitwongse , P. 1971 . Soil‐Plant nutrition studies on Tropical rice (II). Rice varietal differences in absorbing P from soil low in available P (part 2) . 17 : 186 – 194 . Ibid.
- Newman , E. J. 1966 . A method of estimating root length in a sample . Jour. Appl. Ecol. , 3 : 139 – 145 .
- Richards , D. , Goubran , F. H. , Garwali , W. N. and Daly , M. W. 1979 . A machine for determining root length . Plant & Soil , 52 : 69 – 76 .
- Wada , K. and Gunjigake , N. 1979 . Active Al and Fe and phosphate absorption in Ando soils . Soil Sci. , 128 : 331 – 336 .
- Williams , R. F. 1948 . The effects of P supply on the rates of intake of P and N and upon certain aspects of P metabolism in gramineous plants . Aust. J. Sci. Res. Ser. B. , 1 : 333 – 361 .
- Hunt , R. 1972 . A method of estimating root efficiency . Jour. Appl. Ecol. , 9 : 157 – 164 .