A capability to determine the availability of nitrogen in organic amendments is necessary to ensure that such materials will provide sufficient nitrogen to the growing crop and cause minimal environmental degradation. Greenhouse bioassays were used to evaluate N availability of organic by-products, including several employed in the field study of this research. Tall fescue was grown in greenhou...

Four years of grazing trials were conducted with Brassica forages to evaluate their chemical composition and effect on ADG of fattening lambs and breeding ewes in late fall. Brassicas tested included kales (Brassica oleracea L. var. acephala DC), turnips (B. rapa L.), and a chinese cabbage hybrid (B. rapa L. x B. pekinensis [Lour.] Rupr.). Daily gains of lambs varied widely among years (19 to 3...

1 976 Annual Meetings AMERICAN SOCIETY OF AGRONOMY CROP SCIENCE SOCIETY OF AMERICA SOIL SCIENCE SOCIETY OF AMERICA Houston, Texas November 28-December 3,1976 Crop Science Divisions Growth Analysis of T a l l Fescue Genotypes D i f f e r i n g i n Yield and Leaf Photosvntheses. W. W. Wilhelm* and C. J. Nelson, Univ. of Missouri. Leaf growth, d r y mat ter d i s t r i b u t i o n , and carbohydra...

本研究では，地域性種苗を利用した植生工の雨滴に対する侵食防止効果を明らかにすることを最終目的として，クサヨシを生育させた供試体に対する侵食抵抗試験を実施した。比較対象には，外来草本植物のケンタッキーブルーグラスを用いている。土中の根系の発達状況や試験後の侵食深を求めるためにX線CTスキャンを用いた。試験結果から，地上部と根系の両者によって発揮される耐侵食性は，クサヨシもケンタッキーブルーグラスと同程度であることが明らかとなった。ただし，根系のみの耐侵食性は土中に発達した根の太さや根系量等によって，増減することが明らかとなった。

Six year-round, all-forage, three-paddock systems for beef cow-calf production were used to produce five calf crops during a 6-yr period. Forages grazed by cows during spring, summer, and early fall consisted of one paddock of 1) tall fescue (Festuca arundinacea Schreb.)-ladino clover (Trifolium repens L.) or 2) Kentucky blue-grass (Poa pratensis L.)-white clover (Trifolium repens L.). Each of ...