the North Carolina Department of Agriculture and Consumer Services Agronomic Division Laboratory for nutrient analyses ( Hardy et al., 2003 ). The small grain cover was allowed to mature until 2 weeks before the first planting date, when all plots were
E. Ryan Harrelson, Greg D. Hoyt, John L. Havlin, and David W. Monks
Yansheng Li, Ming Du, Qiuying Zhang, Guanghua Wang, Jian Jin, Stephen Herbert, and Xiaobing Liu
Planting date is an important factor affecting soybean grain yield and grain quality. Early planting is recommended for soybean production in the northern and upper Midwest United States ( De Bruin and Pedersen, 2008 ; Robinson et al., 2009
Bradley S. Sladek, Gerald M. Henry, and Dick L. Auld
( Forbes and Ferguson, 1947 ; Patton et al., 2007c ). Planting date may also impact zoysiagrass establishment rate. Patton et al. (2004) reported optimum establishment time of zoysiagrass from seed was from 1 to 15 June. Establishment of ‘El Toro
Harbans L. Bhardwaj and Anwar A. Hamama
, and row spacings as sub-subplots. Each plot consisted of four rows spaced either 37.5 or 75 cm apart with 150 cm distance between plots. Each experiment consisted of four replications per planting date. The rows were 3.6 m long. About 100 seeds were
M. Mergo, E. G. Rhoden, and M. Burns
Intercropping is a management system that maximizes production per unit area of land. Intercropping has to be carried out with crops that are compatible in order to ensure increased productivity. An intercropping study was conducted to determine a suitable planting pattern for corn (Zea mays), an overstory crop, and sweetpotato (Ipomoea batatas), an under-story crop. Five relative planting dates were established for each component crop (3 week; before, 3WB; 2 weeks before, 2WB; simultaneous, SIM; 2 weeks after, 2WA; and 3 weeks after, 3WA planting the other crop). Monocrop of each component was also planted. The marketable yields of sweetpotato were reduced by 48, 57, 75, 76 and 74% when sweetpotato was intercropped with corn and planted 3WB, 2WB, SIM, 2WA and 3WA corn, respectively. Corn grain yields were reduced 28, 28, 26, 57, and 66% when intercropped with sweetpotato beginning 3WB, 2WB, SIM, 2WA and 3WA sweetpotato, respectively. Although yields of individual component crop were reduced in intercrop, there was no significant difference in land utilization. Land equivalent ratio, area time equivalent ratio, and competition ratio were not significantly affected by planting date. Intercropping corn and sweetpotato was compatible when both crops were simultaneously planted.
María Teresa Ariza, Carmen Soria, Juan Jesús Medina-Mínguez, and Elsa Martínez-Ferri
potassium/ha, 85 kg calcium/ha, and 14 kg magnesium/ha between mid-November and mid-May through the irrigation. Expt. 1: Effect of planting date, plant density, and cultivar on yield and the incidence of misshapen fruit. In 2004, an experiment was conducted
Bret Sparks, Gregg Munshaw, David Williams, Michael Barrett, Jeffrey Beasley, and Paul Woosley
this study proved to be just as effective for providing ample recovery from cultivation techniques. Fig. 2. Effect of planting date on kentucky bluegrass turf quality following preplant cultivation techniques averaged across years. Bars represent F
`Chandler' strawberries were planted on four dates to ascertain optimum planting time under central Arkansas conditions. Greenhouse-rooted plugs were planted in four replications in a randomized complete-block design. Each replication was planted in double rows 6 m long on beds with 1.4-m centers. Plots were established on 9/28, 10/7, 10/26, and 11/5. Number of branch crowns, yield, and number of runners/plant indicated that the earliest planting date was too late, and thus, the optimum date was missed. Equivalent yields of 16,173 kg·ha–1 were obtained from the earliest date, dropping to 8539 kg·ha–1 when planted 10 days later.
Robert J. Dufault, Ahmet Korkmaz, Brian K. Ward, and Richard L. Hassell
Extending the production season of melons (Cucumis melo L.) by using very early and late planting dates outside the range that is commercially recommended will increase the likelihood of developing a stronger melon industry in South Carolina. The objective of this study was to determine if early (February) transplanted melons or later (June through July) planting dates are effective in extending the production season of acceptable yields with good internal quality of the melon cultivars: Athena, Eclipse, and Sugar Bowl and Tesoro Dulce (a honeydew melon). Melons were transplanted in Charleston, S.C., in 1998, 1999, and 2000 on 12 and 26 Feb., 12 and 26 Mar., 9 and 23 Apr., 7 and 21 May, 4 and 18 June, and 2 July and required 130, 113, 105, 88, 79, 70, 64, 60, 60, 59, and 56 days from field transplanting to reach mean melon harvest date, respectively. Stands were reduced 67%, 41%, and 22% in the 12 and 26 Feb. and 12 Mar. planting dates, respectively, in contrast to the 26 Mar. planting date but ≤15% in all other planting dates. Planting in February had no earliness advantage because the 12 and 26 Feb. and 12 and 26 Mar. planting dates, all reached mean melon harvest from 19 to 23 June. Comparing the marketable number of melons produced per plot (averaged over cultivar) of the standard planting dates of 12 and 26 Mar. indicated decreases of 21%, 32%, 36%, 36%, 57%, 57%, and 54%, respectively with the planting dates of 9 and 23 Apr., 7 and 21 May, 4 and 18 June, and 2 July. The most productive cultivar of all was `Eclipse', which yielded significantly more melons per plot in all 11 planting dates followed by `Athena' (in 8 of 11 planting dates), `Tesoro Dulce' (7 of 11 planting dates), and `Sugar Bowl' (2 of 11 planting dates). In our study, any planting date with melon quality less than the USDA standard of “good internal quality” or better (Brix ≥9.0) was considered unacceptable because of potential market rejection. Therefore, the earliest recommended planting date with acceptable yield and “good internal quality” was 12 Mar. for all cultivars; the latest planting dates for `Athena', `Eclipse', `Tesoro Dulce', and `Sugar Bowl' were 4 June, 18 June, 7 May, and 9 Apr., respectively. With these recommendations, the harvest season of melons lasted 40 days from 24 June to 3 Aug. for these four cultivars, which extended the production season an additional 2 weeks longer than the harvest date of last recommended 21 May planting date.
Mary A. Rogers and Annette L. Wszelaki
early blight severity by keeping the foliage clean and dry. Additionally, planting date can also influence disease development. Plant diseases caused by anthracnose ( Colletotrichum sp.), early blight, southern blight ( Sclerotium rolfsii ), and