Studies on chemical composition and feeding values in forage crops. 2. The influence of nitrogen fertilization, stage of maturity and growth phase on chemical composition and digestibility of Italian ryegrass forage. 3. Influence of nitrogen fertilization and stage of maturity on chemical composition and digestibility in flint corn fodder. 4. Influence of nitrogen fertilization and stage of maturity on chemical composition and digestibility in oats forage Miaki, T.; Nose, I. J. Jap. Soc. Grassld Sci 12(4): 202-7, 208-12,213-17. Bibl. 9, 11, 7 1967 https://eurekamag.com/research/014/688/014688339.php