References
- Dardanelli JL, Bachmeier OA, Sereno R, Gil R. 1997. Rooting depth and soil water extraction patterns of different crops in a silty loam haplustoll. Field Crops Res. 54:29–38.
- IRRI. 2005. IRRISTAT v5.0 for windows [Internet]. Metro Manila, Philippines; [cited 2010 Aug 22]. Available from: http://www.irri.org/science/software/irristat.asp.
- Johnson BJ. 1971. Effect of weed competition on sunflowers. Weed Sci. 19:378–380.
- Laosuwan P. 1997. Sunflower production and research in Thailand. Suranaree J Sci Tech. 4:159–167.
- Qureshi JA, Stahlman PW, Michaud JP. 2007. Plant population and weeds influence stalk insects, soil moisture, and yield in rainfed sunflowers. Insect Sci. 14:425–435.
- Reddy SS, Stahlman PW, Geier PW, Thompson CE. 2012. Weed control and crop safety with premixed S-metolachlor and sulfentrazone in sunflower. Am J Plant Sci. 3:1625–1631.
- Robinson RG, Ford JH, Luenschen WE, Rabas DL, Smith LJ, Warnes DD, Wiersma JD. 1980. Response of sunflower to plant population. Agron J. 72:869–871.
- Schneiter AA, Miller JF. 1981. Description of sunflower growth stages. Crop Sci. 21:901–903.
- White PF, Oberthur T, Pheav S. 1997. Soil used for rice production in Cambodia: a manual for their recognition and management. Manila: International Rice Research Institute.