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Ellen T. Paparozzi, Jazbaat K. Chahal, Petre Dobrev, Elizabeth A. Claassen, Walter W. Stroup, and Radomira Vankova

(150 mg·L −1 N) ensured regreening of P. parviflorus plants within 3 weeks. The N concentration of plants that received no nitrogen during the experiments were 0.02% ± 0.01%, whereas plants receiving 150 mg·L −1 N ranged from 5.98% to 7

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Bielinski M. Santos

the same mulch as previously described. During all the seasons, treatments were established in a randomized complete block design with six replications. Experimental units were 12.5 ft long (20 plants per plot). Table 1. Effects of preplant nitrogen (N

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Gerry Henry Neilsen, Denise Neilsen, and Linda Herbert

nitrogen (N) applied per tree for each fertigation time, 1999 to 2004. Trees were trained to a slender spindle system supported by posts and grown in a 2.0-m-wide herbicide strip maintained by annual glyphosate applications. Insect and disease

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H.T. Kraus, S.L. Warren, G.J. Bjorkquist, A.W. Lowder, C.M. Tchir, and K.N. Walton

variable where the dependent variable equaled zero. Nitrogen:potassium ratio and nitrogen:phosphorus ratio experiments. During Summer 2005, two concurrent but separate 2 × 6 factorial experiments were conducted in a randomized complete block design (RCBD

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Hadi Susilo and Yao-Chien Alex Chang

), which makes it very versatile and adaptable, both during production and post-harvest. Nitrogen is an important macronutrient in plants. The growth and flowering of Phalaenopsis are significantly affected by the N status in the plants ( Lei, 2007 ; Yu

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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.

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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

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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

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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

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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