Agronomy Journal

MacGregor, J. M.; Taskovitch, L. T.; Martin, W. P.

doi: 10.2134/agronj1961.00021962005300040001xpmid: N/A

Fertilization substantially increased the yield of corn grain, crude protein, and total amino acids, but the concentrations of all amino acids did not progressively increase with increased concentrations of crude protein.

MacGregor, J. M.; Taskovitch, L.; Martin, W. P.

doi: 10.2134/agronj1961.00021962005300040002xpmid: N/A

Amino acid levels in Minnesota alfalfa were generally slightly above those previously reported from other areas. Phosphate and phospate‐potash fertilization produced no appreciable change in amino acid levels, but increased per acre production through increased hay yields.

Youngner, Victor. B.

doi: 10.2134/agronj1961.00021962005300040003xpmid: N/A

Zoysia, bermuda grasses and tall fescue were the most wear resistant turfgrass varieties. Sunturf and U‐3 were the most resistant bermudagrass varieties. Grasses were less resistant to wear from spiked rollers than from scuffing feet. Stoloniferous warm‐season grasses recovered more rapidly than cool‐season grasses. Recovery of bermudagrasses was slower from injury from spiked wear elements than from scuffing feet.

Grava, J.; Spalding, G. E.; Caldwell, A. C.

doi: 10.2134/agronj1961.00021962005300040004xpmid: N/A

Air and oven drying resulted in increases of exchangeable potassium over that extracted from field moist soil. The drying effects were greater in samples from unfertilized plots than in samples from plots receiving moderate and heavy potassium treatments. Air drying had only a slight effect on the extractable phosphorus.

Terman, G. L.; DeMent, J. D.; Engelstad, O. P.

doi: 10.2134/agronj1961.00021962005300040005xpmid: N/A

Response by corn, millet, oats, and wheat grown in greenhouse pots increased in a similar manner at all seasons of the year with increase in water‐soluble P content of applied phosphate fertilizers.

Hallauer, Arnel R.; Russell, W. A.

doi: 10.2134/agronj1961.00021962005300040006xpmid: N/A

Although degree‐days showed a consistent association with grain moisture loss, none of the six selected weather factors for estimating moisture loss was reliable for the period studied.

Crowder, Loy V.; Ramirez, Rodrigo; Chaverra, Hernan

doi: 10.2134/agronj1961.00021962005300040007xpmid: N/A

Performance was best at elevations between 6,500 and 9,000 feet. At lower elevations initial growth was superior but survival was low because of high temperatures, drouth, and diseases. In higher regions the short day, low temperatures, and cloudiness hindered growth. Varieties originating nearest the tropical latitude grew more rapidly as seedlings and during establishment, flowered earlier and more profusely, had higher seed yields, and produced more total forage, but were less persistent.

Bahrani, Bozorg; Taylor, Sterling A.

doi: 10.2134/agronj1961.00021962005300040008xpmid: N/A

The ratio of actual to potential evapotranspiration decreased curvilinearly with the soil matric potential. Most of the reduction took place at high potentials (lower matric suctions). Daily net radiation decreased following alfalfa hay harvest and increased again following irrigation.

McKee, G. W.

doi: 10.2134/agronj1961.00021962005300040009xpmid: N/A

The pH limits for nodulation were 4.5 and 7.9. However, growth and survival of the seedlings, as well as subsequent nodulation, were satisfactory only in a pH range of 6.2 to 7.5. Nodulation was retarded and depressed more than top or root growth by various liming and fertilizer treatments and by inadequate soil moisture. Nodulation may be retarded or completely inhibited on soils subjected to desiccation or to alternating periods of moisture and drouth.

Meyer, R. D.; Olson, R. A.; Rhoades, H. F.

doi: 10.2134/agronj1961.00021962005300040010xpmid: N/A

Field experiments with different crops in Nebraska often have shown a low efficiency of surface applied N fertilizer, especially when broadcasting was done in the fall. As partial explanation, laboratory and greenhouse studies of this problem showed substantial ammonia evolution from fertilized soil particularly with neutral to alkaline soil reaction, with surface application of the fertilizer and with limited moisture. Losses were greatest with urea and urea‐containing materials among the N salts studied. A surface residue accentuated ammonia volatilization, especially with N solution containing urea.