National proceedings: forest and conservation nursery associations—1995.

Landis, Thomas D.; Cregg, Bert M.

doi:10.2737/pnw-gtr-365

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…La calidad de la planta queda reflejada por múltiples factores morfológicos y fisiológicos que están condicionados por factores genéticos, de cultivo y de uso de las plantas en repoblación. Independientemente de los criterios que se utilicen (Puttonen, 1997;Mattson, 1997), el estado nutritivo de la planta representa uno de los factores de cultivo que más cuidadosamente deben controlarse (Landis, 1995). El diagnóstico de deficiencias debe considerarse, por tanto, como una técnica necesaria en viveros forestales, utilizando para ello referencias de síntomas visuales específicos y valores estándar de concentraciones de nutrientes en hojas.…”

Section: Discussionunclassified

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Nutrient deficiencies in three pine species (Pinus sp.) grown in hydroponic culture for one growing season

2001

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The effects of nutrient deficiencies on three pine species (Pinus pinaster Ait., Pinus pinea L. y Pinus halepensis Mill.) are studied in this work. Seeds were planted in a mixture of peat and perlita. When the seedlings reached an adequate size, they were transplanted to hydroponic culture and grown for 4 months (April - July, 1998). Nutrient solutions lacking N, P, K, and Fe, and a control solution were used. During this period, morphological attributes (height, diameter, needles length, and dry weight of shoot and root) and physiological attributes (chlorophyll and nutrient content of needles) were measured, as well as visual symptoms produced by the nutrient deficiencies. Differences were observed depending on the lacking nutrient and the pine species. Nutrient deficiencies affected morphological and physiological attributes and caused growth decrease and visual symptoms. Nevertheless, these effects reached different importance depending on the lacking nutrient and pine species. For example, Fe deficiency caused the greatest and quickest effects, whereas K deficiency hardly affected. Deficiencies effects were greater in shoot growth than in root growth. P. pinaster was the most affected pine species.

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Section: Discussionunclassified

“…4 a 6, Tabla 3). Estos síntomas coinciden con los descritos por otros autores (Timmer, 1991;Landis, 1995). La concentración de clorofila (Fig.…”

Section: Deficiencia De Hierrounclassified

Nutrient deficiencies in three pine species (Pinus sp.) grown in hydroponic culture for one growing season

2001

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“…As a result of this process, more assimilation is produced, resulting in better plant growth. Hawkin [49] added that the nutrients N and Fe are needed for the formation of chlorophyll and the synthesis of proteins contained in chloroplasts and for stimulating plant vegetative growth, such as plant height. This finding corresponds to previous research by Hokmalipour and Darbandi [50], revealing that fertilization using NPK fertilizer with a maximum concentration of 180 kg N ha-1 can increase chlorophyll up to 35% in corn plants.…”

Section: Chlorophyll and Anthocyanin Contentmentioning

confidence: 99%

The Effect of VP3 Biofertilizer and Compost Application on Red Spinach (Amaranthus dubius) and Green Spinach (Amaranthus viridis) Yield and Quality

Arfarita,

Masyhuri,

Sugiarto

et al. 2024

J.Trop.Life.Science

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VP3 biofertilizer is a biological agent that has been formulated in previous research. It was applied once with compost and has been tested on red spinach and green spinach in the greenhouse to see its effect on yield and quality (chlorophyll content, anthocyanins, and shelf life at room temperature). Red spinach and green spinach had shown a significantly different growth response to applying biological fertilizers. VP3 biofertilizer with compost had the highest yield effect but was not significantly different from the recommended Nitrogen Phosphate Potassium (NPK) and Effective Microorganism4(EM4) treatment with compost. The application of VP3 Biofertilizer with NPK fertilizer showed a darker color (higher chlorophyll and anthocyanin content) than the application of biological fertilizers, but the values were not significantly different. The application of VP3 biofertilizer with compost affected the shelf life of both red spinach and green spinach. Spinach plants remained fresh at room temperature for three days of storage, while the other treatments lost freshness on the 3rd day after harvesting and even loosened the leaf on the 4th day after harvesting. Therefore, VP3 biofertilizer has potential to increase the yield and quality of spinach and other vegetable crops. The addition of the application period of VP3 biofertilizer needs to be carried out and observed to increase the yield and quality of plants further. Canonical Variate Analyses (CVA) can distinguish the grouping of treatments based on the selected parameter. Biplot assessment provides information on the strong relationship between the yield of green spinach and red spinach and a number of leaves, leaf area, and plant height. The application of VP3 biofertilizer with compost had a significant effect on the yield and quality and produced different effects between treatments, both in the case of green spinach and red spinach.

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Biochar Can Be a Suitable Replacement for Sphagnum Peat in Nursery Production of Pinus ponderosa Seedlings

Dumroese

Pinto

Heiskanen

et al. 2018

Forests

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We replaced a control peat medium with up to 75% biochar on a volumetric basis in three different forms (powder, BC; pyrolyzed softwood pellets, PP; composite wood-biochar pellets, WP), and under two supplies of nitrogen fertilizer (20 or 80 mg N) subsequently grew seedlings with a comparable morphology to the control. Using gravimetric methods to determine irrigation frequency and exponential fertilization to ensure all treatments received the same amount of N at a given point in the growing cycle, we successfully replaced peat with 25% BC and up to 50% PP. Increasing the proportion of biochar in the media significantly increased pH and bulk density and reduced effective cation exchange capacity and air-filled porosity, although none of these variables was consistent with resultant seedling growth. Adherence to gravimetric values for irrigation at an 80% water mass threshold in the container revealed that the addition of BC and WP, but not PP, required adjustments to the irrigation schedule. For future studies, we encourage researchers to provide more details about bulk density, porosity, and irrigation regime to improve the potential inference provided by this line of biochar and growing media work.

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National proceedings: forest and conservation nursery associations—1995.

Cited by 3 publications

References 32 publications

Nutrient deficiencies in three pine species (Pinus sp.) grown in hydroponic culture for one growing season

Nutrient deficiencies in three pine species (Pinus sp.) grown in hydroponic culture for one growing season

The Effect of VP3 Biofertilizer and Compost Application on Red Spinach (Amaranthus dubius) and Green Spinach (Amaranthus viridis) Yield and Quality

Biochar Can Be a Suitable Replacement for Sphagnum Peat in Nursery Production of Pinus ponderosa Seedlings

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