TY - BOOK TI - Soil genesis and classification (1st ed.) AU - Buol, S. W. AU - Hole, F. D. AU - McCracken, R. J. DA - 1973/// PY - 1973/// PB - Ames: Iowa State University Press SN - 081381460X ER - TY - JOUR TI - PHOTOPERIODIC RESPONSES OF PEANUTS AU - WYNNE, JC AU - EMERY, DA AU - DOWNS, RJ T2 - CROP SCIENCE AB - In an initial experiment the response to photoperiod of six lines representing the two subspecies of Arachis hypogaea L. was measured under two long‐day and two short‐day photoperiodic treatments in the North Carolina State Unit of the Southeastern Environment Laboratories. All treatments were at constant day/night temperatures of 30/26 C for 64 days. Vegetative growth of the plants was reduced by shortday treatments. However, plants grown under short days produced more fruit than plants subjected to long‐day treatments. A second experiment tested the interactions of photoperiod with temperature and their effects on reproductive and vegetative characters of peanuts. Three lines of A. hypogaea were exposed to long and short days at 30/26, 26/22, and 22/18 C. Plants grown under short days were smaller in size but produced more fruit than plants grown under long days. The greater fruit production of plants grown under short days was not caused by differences in flowering intensity, but by factors that occurred after flowering. DA - 1973/// PY - 1973/// DO - 10.2135/cropsci1973.0011183X001300050006x VL - 13 IS - 5 SP - 511-514 SN - 0011-183X ER - TY - JOUR TI - Multivariate analysis and group distribution in the world collection of Eleusine coracana Gaertn AU - Hussaini, S. H. T2 - Dissertation Abstracts International. B, Sciences and Engineering DA - 1973/// PY - 1973/// VL - 34 IS - 5 SP - 2472 ER - TY - JOUR TI - Effects of simulated hail damage on yield and value of flue-cured tobacco AU - Hawks, S. N., Jr. AU - Collins, W. K. AU - Kittrell, B. U. T2 - Tobacco International DA - 1973/// PY - 1973/// VL - 175 IS - 1 SP - 32 ER - TY - JOUR TI - Effects of potassium and magnesium at three rates on yield and price of flue-cured tobacco AU - Hawks, S. N., Jr. AU - Terry, D. L. AU - Collins, W. K. T2 - Tobacco International DA - 1973/// PY - 1973/// VL - 175 IS - 11 SP - 55 ER - TY - JOUR TI - Effects of dolomitic limestone, gypsum, and potassium on planting seed quality, yield, and grade of peanuts, Arachis hypogaea L AU - Sullivan, G. A. T2 - Dissertation Abstracts International. B, Sciences and Engineering DA - 1973/// PY - 1973/// VL - 34 IS - 6 SP - 2415 ER - TY - JOUR TI - Effects of a humate material on the yield and composition of flue-cured tobacco AU - Vaughan, J. M. AU - Collins, W. K. AU - McCants, C. B. T2 - Tobacco International DA - 1973/// PY - 1973/// VL - 175 IS - 8 SP - 23 ER - TY - JOUR TI - EVALUATION OF HERBICIDES IN ESTABLISHMENT OF ALFALFA, LADINO WHITE CLOVER, AND CROWNVETCH AU - COPE, WA AU - WALDREP, TW AU - CHAMBLEE, DS AU - LEWIS, WM T2 - AGRONOMY JOURNAL AB - Abstract Five experiments were conducted to determine the effects of herbicides on seedling injury and on weed control in the establishment of alfalfa ( Medicago sativa L.), ladino clover ( Trifolium repens L.), and crownvetch ( Coronilla varia L.) in North Carolina. Six treatments with commercial herbicides were included in the series of tests, and a number of other commercial and experimental herbicides were included in one or more of the tests. Two of the five tests were spring seeded to determine the feasibility of using herbicides for successful spring seeding in the area as opposed to the standard practice of fall seeding. Each herbicide was tested in either a preplant incorporated, preemergence, or postemergence application. Herbicide effects were measured in terms of legume stands, vigor, and injury ratings. All the herbicides caused some injury but certain herbicides were only slightly injurious while giving excellent weed control. In prepllant incorporated applications, S‐propyl dipropylthiocarbamate (vernolate) and S‐ethyl dipropylthiocarbamate (EPTC) provided excellent weed control and insignificant injury to all legumes. The higher of two rates of vernolate and EPTC were only slightly more injurious to the legumes than the lower rates. Preplant incorporated treatments of N ‐butyl‐ N ‐ethyl‐ a,a,a ‐triflouro‐2,6‐dinitro‐ p ‐toluidine (benefin), 4‐(methylsulfonyl)‐2,6‐dinitro‐ N,N ‐ dipropylaniline (nitralin), and a,a,a ‐triflouro‐2,6‐dinitro‐ N,N ‐dipropyl‐p‐toluidine (trifluralin) generally gave low injury, but effects were variable for tests and legume species, especially at the higher rate. Postemergence treatment with 2‐sec‐butyl‐4,6‐dinitrophenol (dinoseb) caused little injury in certain tests but resulted in severe defoliation in others, with the least injury to alfalfa and the most to crownvetch. None of the herbicides used in preemergence applications gave good weed control without severe legume injury. There were no readily apparent differences between fall and spring effects of the herbicides. Injury to legumes in one test on sandy soil was generally greater than in the four tests on clay soil. DA - 1973/// PY - 1973/// DO - 10.2134/agronj1973.00021962006500050044x VL - 65 IS - 5 SP - 820-825 SN - 0002-1962 ER - TY - JOUR TI - COMPOSITIONAL VARIATIONS IN 3 TYPICAL HAPLUDULTS CONTAINING MICA AU - COOK, MG T2 - SOIL SCIENCE DA - 1973/// PY - 1973/// DO - 10.1097/00010694-197302000-00011 VL - 115 IS - 2 SP - 159-169 SN - 0038-075X ER - TY - JOUR TI - RESPONSE OF BRAGG SOYBEAN TO TIBA (2,3,5-TRIIODOBENZOIC ACID) AU - CLAPP, JG T2 - AGRONOMY JOURNAL AB - Abstract Studies involving the use of TIBA (2,3,5‐triiodobenzoic acid) on indeterminate soybeans [ Glycine max (L.) Merrill] have shown that increased grain yields are more likely to occur when the growth regulator is applied as a single application during flower initiation. TIBA studies using determinate varieties are more limited. Results from these studies are more erratic and yield increases are more likely to be associated with a much earlier time of application. In order to determine the most appropriate method of applying TIBA to determinate soybeans, a single rate (38g/ha) of TIBA was applied to the soybean variety ‘Bragg’ either in a single or in multiple applications during early vegetative growth stages for two years in field experiments. TIBA applications during the two, four, or six trifoliolate growth stage increased soybean yields over the 2‐year period. These yield increases ranged from 7.0 to 9.8%. In general, a single application was just as effective as multiple applications in increasing yields. Plant height was reduced by as much as 13.3% when TIBA was applied at either the four or six trifoliolate growth stage. This reduction in plant height did not help reduce lodging as has been reported for TIBA applications made later in the growing season on indeterminate varieties. In this study TIBA either had no effect on lodging or increased lodging. DA - 1973/// PY - 1973/// DO - 10.2134/agronj1973.00021962006500010012x VL - 65 IS - 1 SP - 41-43 SN - 1435-0645 ER - TY - JOUR TI - RATE AND TIME OF NITROGEN APPLICATION ON BLUEBOY WHEAT (TRITICUM-AESTIVUM L) AU - CLAPP, JG T2 - AGRONOMY JOURNAL AB - Abstract The semi‐dwarf, stiff‐strawed soft winter wheat variety ‘Bineboy’ ( Triticum aestivum L.) was released in 1965 by the North Carolina State University Agricultural Experiment Station. Presumably, its greater straw strength would allow producers to use higher rates of nitrogen without as much risk of lodging. Information was needed, however, on the nitrogen requirements of this new type of wheat and the most beneficial time for these applications. Field experiments were conducted on two soil types (Davidson clay loam and Lynchburg fine sandy loam) for 2 years to determine the response of Bluehoy wheat to nitrogen rates of 56, 112, 168, and 224 kg/ha applied at seeding in October or partly in October at seeding (56 kg/ha) and partly in February as topdressing rates of 56, 112, and 168 kg/ha. Applying all the nitrogen at seeding on the Davidson clay loam was just as effective for high grain yields and high test weight as the split applications. The 112 kg/ha applied in October (seeding) on this soil type was sufficient for maximum yields. Grain yields were lower on the Lynchburg fine sandy loam soil for October applications than for February applications at nitrogen rates of 112 and 168 kg/ha. No difference in yield was obtained for the two dates at the highest rate of nitrogen (224 kg/ha). Test weights were significantly lower both years when the nitrogen was applied in February on the Lynchburg fine sandy loam as compared to the same total rate applied at seeding. A similar trend was also found for the February nitrogen applications on the Davidson clay loam. This study shows that Blueboy wheat producers can apply all of the nitrogen fertilizer to clay loams and fine sandy loam soils at the time of seeding rather than splitting the application into a small amount at seeding followed by a topdressing in February. A higher level of nitrogen fertilization will be required, however, to offset possible losses from leaching on soils with a sandy surface texture. On these soils producers must weigh the cost of using a higher nitrogen rate at seeding against the possibility of producing a lower‐quality wheat and the cost of an extra trip over the field in February when fields may be wet. DA - 1973/// PY - 1973/// DO - 10.2134/agronj1973.00021962006500010002x VL - 65 IS - 1 SP - 5-7 SN - 1435-0645 ER - TY - JOUR TI - COW AND CALF GAINS ON LADINO CLOVER-TALL FESCUE AND TALL FESCUE, GRAZED ALONE AND WITH COASTAL BERMUDAGRASS AU - BURNS, JC AU - GOODE, L AU - GROSS, HD AU - LINNERUD, AC T2 - AGRONOMY JOURNAL AB - Abstract Cows and calves were used in a 2‐year study to determine the quality, as measured by calf gains, of tall fescue ( Festuca arundinacea ) pasture, with and without ladino clover ( Trifolium repens ) grazed alone or in combination with ‘Coastal’ bermudagrass ( Cynodon dactylon (L) Pers.). Pastures were managed to limit any adverse influence of forage quantity or quality on calf gain. Gain per calf was highest on ladino‐tall fescue (L‐TF) pastures during the entire trial. In period 1 (initiation of grazing until May 31) calves on tall fescue (TF) averaged 6 kg/head less than those grazing L‐TF (43.3 vs 37.3 kg). During the critical summer months calves on the L‐TF + Coastal bermudagrass (CB) and TF + CB systems averaged 73.1 and 68.3 kg/head, respectively, compared with 79.9 kg for L‐TF. Total seasonal gains from the L‐TF treatment averaged only 4 kg/head more than the L‐TF + CB system (122.1 vs 118.1). Although seasonal calf gains from the TF + CB system were lower (105 kg/head) than L‐TF + CB, they were acceptable (0.68 kg/head per day) and justify quantitative evaluation of a pure grass system. DA - 1973/// PY - 1973/// DO - 10.2134/agronj1973.00021962006500060009x VL - 65 IS - 6 SP - 877-880 SN - 0002-1962 ER -