Search Results

You are looking at 81 - 90 of 1,584 items for :

  • optimization x
  • Refine by Access: All x
Clear All
Free access

K.R. Goldman and C.A. Mitchell

Mineral resources will be recycled in a controlled ecological life-support system (CELSS) deployed in space. N typically is supplied to crops as \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NO}_{3}^{-}\) \end{document} or \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}+\mathrm{NO}_{3}^{-}\) \end{document} mixtures. In a CELSS, \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} will be abundant, but nitrification will require energetically costly chemical or biological \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} oxidization. Rice is tolerant of \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} and preferentially absorbs \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} if provided a 1 \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NO}_{3}^{-}\) \end{document}: 1 \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} ratio in hydroponics. Hybrid rice absorbs more N as \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} than does inbred rice. To determine how much and in what proportion to \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NO}_{3}^{-}\) \end{document} rice will tolerate \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} and how varying N sources will affect grain yield, semi-dwarf hybrid rice cultivar `Ai-Nan-Tsao' was grown hydroponically in a growth chamber. Nutrient solutions supplied 5 mm N as 40%, 60%, or 80% \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document}, the remainder as \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NO}_{3}^{-}\) \end{document}. Periodic analysis of solutions tracked mineral uptake, and solutions were modified to maintain proper concentrations. Treatment stands were harvested 84 to 86 DAP. Across all treatments, yield characteristics were similar but were highest for the border plants, presumably due to greater light absorption. Yield-efficiency rate (YER: grams of grain·per cubed meter per day·[grams inedible shoot biomass]) was 0.09 for all treatments (border) and ranged from 0.03 to 0.05 (interior), Harvest index ranged from 0.28 to 0.30 (border) and 0.26 to 0.39 (interior). Edible yield rate (EYR: grams of grain per cubed meter per day) ranged from 20.97 to 26.45 (border) and 8.52 to 14.96 (interior). The sector provided with 80% \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document} had the highest YER, HI (interior), and EYR (interior), indicating that rice productivity was not limited by high percentages of N supplied as \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(\mathrm{NH}_{4}^{+}\) \end{document}. Supported by NASA grant NAGW-2329.

Free access

Clinton C. Shock and Feng-Xin Wang

irrigation ( Tjosvold and Schulbach, 1991 ). The nutrients lost in the excess irrigation water have the potential to contaminate groundwater and surface water. Careful irrigation scheduling by SWT provides the grower with techniques to simultaneously optimize

Free access

Joey H. Norikane

of biomass would have the value of $1 million. But, there are significant embedded costs, in terms of time and money, for hybrid vector development and optimization, expression screening of multiple constructs, purification scale-up and process

Free access

Martin M. Williams II

significant interaction between hybrid and plant density ( P ≥ 0.870). Ear yield was optimized at 5.5 plants/m 2 and gross profit margin was optimized at 6.1 plants/m 2 ( Fig. 2 ). If data from growers’ fields reflect actual plant densities that white

Free access

Gary W. Stutte

photosynthesis ( McCree, 1972 ) to allow the photosynthetic efficiency of a given wavelength to be evaluated as well. These well-defined parameters allow the spectra to be optimized for both photosynthesis and photomorphogenesis. Table 2. Spectral files of

Full access

Stefania De Pascale, Luisa Dalla Costa, Simona Vallone, Giancarlo Barbieri, and Albino Maggio

cultivation for a specific environment. These practices include selecting the most suitable and adapted species/cultivar for specific pedoclimatic conditions, and optimizing the timing for planting/harvesting ( Fig. 2 ). To increase WUE at farm level, the

Free access

Arthur Villordon, Christopher Clark, Tara Smith, Don Ferrin, and Don LaBonte

DAT) to optimize decision-making. In Louisiana, a calendar-based system is used for recommending transplanting dates, i.e., 15 Apr. to 30 June for south Louisiana and 1 May to 30 June for north Louisiana ( Boudreaux, 2005 ). In North Carolina, the

Free access

Orville C. Baldos, Joseph DeFrank, Matthew Kramer, and Glenn S. Sakamoto

-ripening after drying is known to remove seed dormancy and subsequently improve germination, storage conditions to optimize this process for tanglehead seeds have yet to be determined. Temperature and relative humidity are important storage conditions that affect

Free access

Xiaofeng Yang, Gang Li, Weihong Luo, Lili Chen, Shaopeng Li, Ming Cao, and Xuebin Zhang

destruction of crumb structure ( Beman et al., 2005 ; Castellanos et al., 2013 ). Therefore, the optimization of greenhouse crop nitrogen management is of utmost importance to secure product quality of the muskmelon, which also plays a crucial role in

Full access

Haby Sanou, Daouda Sidibé, Adama Korbo, and Zewge Teklehaimanot

, Niger, and Senegal revealed that ber is among the farmers’ 10 most preferred tree species ( Bonkoungou et al., 1998 ). However, because of the small size of fruit (1–2 g per fruit) and its sensitivity to parasitic attacks, its use for optimizing the