Agronomy Journal

Petersen, R. G.; Weswig, P. H.; Cowan, J. R.

doi: 10.2134/agronj1958.00021962005000030001xpmid: N/A

Consistent differences in apparent palatability among 20 genotypes of tall fescue were demonstrated by observing the behavior of a number of sheep grazing a replicated small‐plot nursery. This observational technique was found to be preferred to clipping a sample of forage before and after grazing and estimating palatability by difference.

Coleman, Otto H.; Stokes, I. E.

doi: 10.2134/agronj1958.00021962005000030002xpmid: N/A

In the sorgo cross, Sart × Iceberg, the erectness of Sart was inherited as a simple dominant (EE) to the weak stalk (ee) of Iceberg. This factor pair was inherited independently of the factor pairs governing anthracnose resistance (Ll) and stalk red rot resistance (Lsls).

Duvick, Donald N.

doi: 10.2134/agronj1958.00021962005000030003xpmid: N/A

Performance patterns of several corn hybrids were changed with respect to grain yield, barrenness, tillering and in one instance, root lodging when Texas (T) cytoplasm was substituted for the hybrids' normal cytoplasm. Grain yield and barrenness of another hybrid were affected when USDA (S) cytoplasm was substituted for its normal cytoplasm. The extent and direction of these induced changes were markedly affected by (1) the genotype and (2) the physical environment during the growing season.

Miller, P. A.; Williams, J. C.; Robinson, H. F.; Comstock, R. E.

doi: 10.2134/agronj1958.00021962005000030004xpmid: N/A

Plot error variances were large for lint yield, bolls per plant, seed per boll, and boll weight; small for lint percentage, seed and tint index, and fiber length, strength and fineness. Genotype x environment interaction variances were generally small for all traits except yield and bolls per plant. Lint yield was highly positively correlated with lint percentage and bolls per plant and negatively correlated with seed index and weight per boll.

Chichilo, P.; Whittaker, Colin W.

doi: 10.2134/agronj1958.00021962005000030005xpmid: N/A

Compared to amounts of elements removed from the soil by cropping or to amounts added to soils to correct deficiencies many limestones of the Atlantic Coast Regions contain important amounts of magnesium, iron, manganese, molybdenum, sulfur and zinc at ordinary application rates. On the same basis, amounts of potassium, phosphorus, boron and copper are of much less importance.

Stitt, R. E.

doi: 10.2134/agronj1958.00021962005000030006xpmid: N/A

Yields of 7 species of grass were highly correlated with April–May precipitation (2.24 to 6.18 inches) during an 8‐year period. Ladak alfalfa grown with crested wheatgrass increased total yields during the last 5 years of an 8‐year period, owing possibly to nitrogen contributed by the alfalfa. Fifty pounds of nitrogen and 20 pounds P2O5 applied to 8‐year‐old stands increased yields of all species and mixtures. Renovation decreased yield during the treatment year and increased yields the year following.

Hackerott, H. L.; Harvey, T. L.; Sorensen, E. L.; Painter, Reginald H.

doi: 10.2134/agronj1958.00021962005000030007xpmid: N/A

Alfalfa varieties in the seedling stage varied widely in percentages of survival following infestation with spotted alfalfa aphids. Alfalfas of Turkistan origin generally ranked highest. Resistant plants may be selected from most varieties tested as indicated by the increased survival of polycross progenies of plants surviving seedling infestation. Greenhouse results are indicative of field reaction to natural infestation at least in the seedling stage at relatively high temperatures.

Seth, Jagdish; Dexter, S. T.

doi: 10.2134/agronj1958.00021962005000030008xpmid: N/A

In no way could the anatomy of the wilt resistant varieties of alfalfa be differentiated from that of the susceptible varieties. Short days caused a notable decrease and recumbence in top growth of the winter‐hardy varieties. The annual growth rings of the field‐grown roots of hardy varieties revealed formation of large xylem vessels during long days and small xylem vessels during shorter days. The same contrast in vessel size was seen in the greenhouse‐grown roots of hardy varieties but it was less prominent in nonwinter‐hardy varieties.

Aldrich, Richard J.

doi: 10.2134/agronj1958.00021962005000030009xpmid: N/A

Plants in the minimum fertility level were relatively unaffected by 2,4‐D in any stage. At the medium fertility level yields were reduced most by treatment during the seedling stage but were also reduced significantly by treatment during anthesis. Mean yields at the high fertility level were reduced significantly only by treatment during anthesis.

Lawton, K.; Tesar, Milo B.

doi: 10.2134/agronj1958.00021962005000030010xpmid: N/A

In greenhouse trials, significant increases in yield and K absorption of alfalfa and bromegrass were obtained as applied K increased. Yield response to fertilizer K was less marked with soil containing more available soil K. Total production of bromegrass was half that of alfalfa, but the quantities of K removed were about equal. The change in several extractable fractions of soil K was directly related to the root distribution pattern of the forage.