Jong, F. S.; PT National Timber & Forest Products, Jalan Yani 105, Selatpanjang, Riau 2875
fsjong@indosat.net.id; Widjono, Adi; Pusat Penelitian dan Pengembangan Tanaman Pangan, Bogor adiwidjono@cbn.net.id; adiwidjono@yahoo.com; 08128574451 (Puslitbang Tanaman Pangan, )