| Phosphorus uptake by pigeon pea and its role in cropping systems of the Indian subcontinent JC Ae N, Arihara J, Okada K, Yoshihara K Science 248, 477-480, 1990 | 905 | 1990 |
| Silicon deficiency and the adaptation of tropical rice ecotypes MD Winslow, K Okada, F Correa-Victoria Plant and Soil 188, 239-248, 1997 | 120 | 1997 |
| Interactive effects of Al, Ca and other cations on root elongation of rice cultivars under low pH T Watanabe, K Okada Annals of Botany 95 (2), 379-385, 2005 | 116 | 2005 |
| Suppression of nitrification and nitrous oxide emission by the tropical grass Brachiaria humidicola T Ishikawa, GV Subbarao, O Ito, K Okada Roots: The Dynamic Interface between Plants and the Earth: The 6th Symposium …, 2003 | 100 | 2003 |
| Phosphorus response of chickpea and evaluation of phosphorus availability in Indian Alfisols and Vertisols. N Ae, J Arihara, K Okada | 79 | 1991 |
| Differential responses of growth and nitrogen uptake to organic nitrogen in four gramineous crops M Okamoto, K Okada Journal of experimental botany 55 (402), 1577-1585, 2004 | 73 | 2004 |
| Phosphorus uptake mechanisms of pigeon pea grown in Alfisols and Vertisols N Ae, J Arihara, K Okada Phosphorus nutrition of grain legumes in the semi-arid tropics. Patancheru …, 1991 | 72 | 1991 |
| Soil microbial biomass and activities in a Japanese Andisol as affected by controlled release and application depth of urea HY Chu, Y Hosen, K Yagi, K Okada, O Ito Biology and Fertility of Soils 42, 89-96, 2005 | 54 | 2005 |
| The role of piscidic acid secreted by pigeonpea roots grown in an Alfisol with low-P fertility N Ae, J Arihara, K Okada, T Yoshihara, T Otani, C Johansen Genetic Aspects of Plant Mineral Nutrition: The Fourth International …, 1993 | 54 | 1993 |
| Glucosinolate content in rapeseed in relation to suppression of subsequent crop S Yasumoto, M Matsuzaki, H Hirokane, K Okada Plant Production Science 13 (2), 150-155, 2010 | 38 | 2010 |
| Root development of pigeonpea and chickpea and its significance in different cropping systems J Arihara, N Ae, K Okada Phosphorus Nutrition of Grain Legumes in the Semi-arid Tropics. Patancheru …, 1991 | 37 | 1991 |
| Cycling of carbon in a paddy field: I. Carbon dioxide exchange between the surface of a paddy field and the atmosphere T Yamagishi, K Okada, T Hayashi, A Kumura, Y Murata Japanese Journal of Crop Science 49 (1), 135-145, 1980 | 35 | 1980 |
| Growth responses of cereal crops to organic nitrogen in the field M Okamoto, K Okada, T Watanabe, N Ae Soil science and plant nutrition 49 (3), 445-452, 2003 | 33 | 2003 |
| Effects of plant residue, root exudate and juvenile plants of rapeseed (Brassica napus L.) on the germination, growth, yield, and quality of subsequent crops in successive and … S Yasumoto, K Suzuki, M Matsuzaki, S Hiradate, K Oose, H Hirokane, ... Plant Production Science 14 (4), 339-348, 2011 | 32 | 2011 |
| Effects of high water table and short-term flooding on growth, yield, and seed quality of sunflower S Yasumoto, Y Terakado, M Matsuzaki, K Okada Plant Production Science 14 (3), 233-248, 2011 | 28 | 2011 |
| Effects of traditional soil management practices on the nutrient status in Sahelian sandy soils of Niger, West Africa K Suzuki, R Matsunaga, K Hayashi, N Matsumoto, R Tabo, S Tobita, ... Geoderma 223, 1-8, 2014 | 27 | 2014 |
| Effects of silicon fertilization on disease development and yields of rice in Colombia FJ Correa-Victoria, LE Datnoff, K Okada, DK Friesen, JI Sanz, GH Snyder Studies in plant science 8, 313-322, 2001 | 26 | 2001 |
| Silicon deficiency of upland rice on highly weathered Savanna soils in Colombia. I. Evidence of a major yield constraint DK Friesen, JI Sanz, FJ Correa, MD Winslow, K Okada, LE Datnoff, ... IX Conferência Internacional de arroz para a América Latina e para o Caribe …, 1994 | 21 | 1994 |
| Adaptation mechanisms of upland rice genotypes to highly weathered acid soils of South American savannas K Okada, AJ Fischer Plant Nutrient Acquisition: New Perspectives, 185-200, 2001 | 19 | 2001 |
| Soil aeration status of alfisols and vertisols as a limiting factor for growth of pigeonpea K Okada, N Ae, J Arihara, C Johansen, KL Sahrawat Phosphorus Nutrition of Grain Legumes in the Semi-Arid tropics. Eds C …, 1991 | 18 | 1991 |
