These hydrometers are used to determine the specific gravity of soil in the range of 0.995 to 1.038, or -5 to 60 g/L (using a weight by volume scale). Made of lead free ballast and glass, these 280mm (11”) long hydrometers conform to the accuracy requirements of ASTM hydrometers. Each is individually serialized and has a temperature standardization of 68 degrees F/68 degrees F. DURAC Soil Analysis ASTM Hydrometers are hand inspected by our U.S. quality team in our exclusive triple accredited/registered ISO/IEC 17025:2005 and A2LA Accredited Calibration Laboratory; internationally recognized and accepted by the signatory economies of the ILAC /MRA and located in our ISO 14001:2004 Environmental Management System registered facility. They are packaged with a multi-language (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy indicating accuracy traceable to NIST. Note: Soil analysis hydrometers should be stored in a clean, dry, safe place, and should not be subjected to extreme temperatures.
1490402 2 QT P Features: -Washed sand. -Added to mixes to increase the bulk density of the mix making it easier to grow outdoors. -Washed sand is the refined horticulture alternative to your native sand. -Western region only. Product Type: -Potting Soil and Ammendments. Generic Dimensions: -2″ H x 11.5″ W x 8.38″ D, 5 lbs. Dimensions: Overall Height – Top to Bottom: -2 Inches. Overall Width – Side to Side: -11.5 Inches. Overall Depth – Front to Back: -8.38 Inches. Overall Product Weight: -5 Pounds.
PLR filters continue the brand’s long legacy of superior optical solutions. All our filters are carefully formulated to ensure consistent color and accuracy throughout the entire surface of the glass. Why? Consistent color means consistent high quality results. We know that a poorly made filter makes a great lens and camera worthless, that’s why the our frame rings are constructed of special alloys that won’t expand or contract over time or due to temperature extremes-it’s also why we back our filters with an 10 year warranty-because we engineer them to last.
Like all PLR optics, PLR filters are precision manufactured to the most demanding of tolerances. This ensures consistent high quality results even after years of use.
Respected and known worldwide in the field for his research in plant nutrition, Dr. Horst Marschner authored two editions of Mineral Nutrition of Higher Plants. His research greatly advanced the understanding of rhizosphere processes and trace element uptake by plants and he published extensively in a variety of plant nutrition areas. While doing agricultural research in West Africa in 1996, Dr. Marschner contracted malaria and passed away, and until now this legacy title went unrevised. Despite the passage of time, it remains the definitive reference on plant mineral nutrition.
Great progress has been made in the understanding of various aspects of plant nutrition and in recent years the view on the mode of action of mineral nutrients in plant metabolism and yield formation has shifted. Nutrients are not only viewed as constituents of plant compounds (constructing material), enzymes and electron transport chains but also as signals regulating plant metabolism via complex signal transduction networks. In these networks, phytohormones also play an important role. Principles of the mode of action of phytohormones and examples of the interaction of hormones and mineral nutrients on source and sink strength and yield formation are discussed in this edition. Phytohormones have a role as chemical messengers (internal signals) to coordinate development and responses to environmental stimuli at the whole plant level. These and many other molecular developments are covered in the long-awaited new edition.
Esteemed plant nutrition expert and Horst Marschner’s daughter, Dr. Petra Marschner, together with a team of key co-authors who worked with Horst Marschner on his research, now present a thoroughly updated and revised third edition of Marschner’s Mineral Nutrition of Higher Plants, maintaining its value for plant nutritionists worldwide.
Key Features * Second Edition of this established text * Structure of the book remains the same * 50% of the reference and 50% of the figures and tables have been replaced * Whole of the text has been revised * Coverage of plant (soil interactions has been increased considerably)
