Search Results

You are looking at 81 - 90 of 4,538 items for :

  • Refine by Access: All x
Clear All
Free access

Angela O'Callaghan

Nitrogen is essential to development of bulbing crops such as garlic (Allium sativum L.). Little scientific research thus far has concentrated on the optimum timing and concentration of applied N fertilizer for garlic grown under conditions found in the northeastern United States. A trial in Freeville, N.Y., on a gravely loam soil used three levels of ammonium nitrate fertilizer, 0 kg·ha–1, 52 kg·ha–1 sidedressed in mid-Apr., and 52 kg·ha–1 applied in mid-Apr. and early June 1995. The samples included a nonbolting (softneck) garlic and a bolting (topset) clone `Spanish Roja', both grown under wheat (Triticum aestivum) straw mulch. A separate trial in East Ithaca studied the same clones plus another topset, Merrifield Rocambole, on a sandy loam soil, using two levels, 0 and 52 kg·ha–1, of ammonium nitrate applied in mid-April only. The East Ithaca trial also examined the efficacy of hairy vetch (Vicia villosa Roth) as an alternate N source. Application of ammonium nitrate in April increased average bulb size of topset in Freeville >30%, and the average bulb size of softneck by 23%. Applying in April and June increased average bulb size of topset by 35% and of softneck by 26%. Earlier timing of the second application might enhance these increases. The East Ithaca trial found N fertilization increased average bulb size by 30% for `Spanish Roja', by 20% for Merrifield Rocambole, and 23% for softneck. Analysis of leaf tissue of garlic grown with vetch found that ammonium N increased by 22% to 28% in topset garlic and 14% to 26% in softneck. These results indicate that N fertilization, in the form of either chemical fertilizer or a legume, can benefit this crop in northeastern United States.

Free access

Amy L. Shober, Andrew K. Koeser, Drew C. McLean, Gitta Hasing, and Kimberly K. Moore

, particularly nitrogen (N) and phosphorus (P), are lost in leachate or runoff. For example, Line et al. (2002) reported that the average total N and P exported from a residential setting was 269% and 302%, respectively, greater than from wooded sites. Although

Free access

M. Pilar Bañados, Bernadine C. Strik, David R. Bryla, and Timothy L. Righetti

analysis. Back-transformed values are presented in figures and tables. Plant response to N fertilizer application rate was determined using orthogonal contrasts and pairwise comparisons. Results and Discussion Plant growth. Nitrogen fertilizer application

Free access

Thomas G. Bottoms, Richard F. Smith, Michael D. Cahn, and Timothy K. Hartz

kg·ha −1 in the grower N treatment, suggesting inefficient use of the N applied at first sidedressing, which averaged 77 kg·ha −1 . Table 1. Effect of sidedress N reduction on aboveground lettuce fresh biomass, and biomass nitrogen (N), in the

Full access

Thomas A. Obreza and Arnold Schumann

. To remain sustainable, the industry must improve nitrogen (N) and phosphorus (P) fertilizer use efficiency because total maximum daily load implementation will limit N and/or P loading in watersheds where citrus is grown. The objectives of this

Free access

Mindy L. Bumgarner, K. Francis Salifu, and Douglass F. Jacobs

levels (0 versus 1.2 g nitrogen/plant), and media composition at three levels. The fertilizer treatment consisted of incorporation of CRF (Osmocote Plus 5–6 months release 15N–9P–12K with micronutrients; Scotts Co., Marysville, OH) at the time of media

Open access

Sabahudin Hadrović, Filip Jovanović, Sonja Braunović, Saša Eremija, Zoran Miletić, Snežana Stajić, and Igor Golić

results of an investigation of the most suitable species for biomass production could make a significant contribution to science and practice ( Hadrović et al., 2019 ). In addition, low nitrogen (N) availability is a major limiting factor for plant growth

Free access

Emily R. Vollmer, Nancy Creamer, Chris Reberg-Horton, and Greg Hoyt

success of conservation tillage in organic systems is highly influenced by management of crop rotation for weed and disease control and nitrogen availability. Cover crops used in rotation with cash crops require additional management; however, they also

Free access

David R. Bryla, Bernadine C. Strik, M. Pilar Bañados, and Timothy L. Righetti

). Nitrogen is the predominant nutrient applied to blueberry for successful commercial growth and production. Although the blueberry plant is relatively small and slow-growing compared with many temperate fruit tree crops, the amount of N fertilizer applied to

Free access

Monica Ozores-Hampton, Francesco Di Gioia, Shinjiro Sato, Eric Simonne, and Kelly Morgan

winter season, respectively ( Sato et al., 2009a ). For both trials, fertilizer treatments consisted of two N rates: the UF/IFAS N recommended rate of 224 kg·ha −1 and a CG rate of 358 kg·ha −1 . Nitrogen rates were applied in pretransplanting and