Lec11MineralNutritionNotes

Httpcasoilresourcelawru cdavisedusoilwebgmap mineral

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Unformatted text preview: ed (binded). Text Mineral Nutrition Nutrient Availability • Soil pH – Primary factor influencing nutrient availability • Davis area – Iron Compare pH of Davis versus Hanford CEC and soil texture Awesome resource! http://casoilresource.lawr.u cdavis.edu/soilweb_gmap/ Mineral Nutrition as you go more basic the source is less available the more you go acid the more it is available Nutrient Availability • Soil pH – Primary factor influencing nutrient availability • Hydrangea – Al used for blue pigment – Low pH -> Al available -> blue flowers – High pH -> Al unavailable -> red/pink flowers – Why is Al not a micronutrient? http://www.usna.usda.gov/Gardens /faqs/hydrangeafaq2.html http://www.theflowerexpert.com/ Mineral Nutrition http://llandryn.net/ Nutrient Availability • Biological immobilization – Reduced N after application of high C/N organic matter (e.g. sawdust) • Microbes use N to decompose C in material the percentage to C to N ratio. activity of the inside the soil affects the avialabitity?? http://www.sare.org/ Mineral Nutrition Root-Soil Interactions • Root system – Ability of plants to absorb water and nutrients depends on extent of root system • Anatomy – Root hairs » Contribute about 2/3 of total root surface area http://plantphys.info/ Root hair increases the SA to Vol of the root for better absorption http://botit.botany.wisc.edu/ Mineral Nutrition Root-Soil Interactions • Root system – Locations for water and mineral uptake • Besides root hairs, most mineral uptake at or near the immature zone or the elongation zone also root tip, but some absorption does uptake of nutrients and root tip and maturation zone along entire root length* does really have that much uptake. but first is root hair and then elongation zone • Depends on nutrient being for uptake studied • Depends on soil texture and soil moisture the point of this is where in the root is where nutrients from the soil and basically root hair is important for this Mineral Nutrition Root-Soil Interactions • Root system – Locations for water and mineral uptake • Besides root hairs, most mineral uptake at or near root tip, but some absorption along entire root length • Depends on nutrient being studied • Depends on soil texture and soil moisture* Mineral Nutrition Root-Soil Interactions there is a high density of root near the surface • Root system – Morphology • Genetically controlled • Fibrous root system • Taproot – Why no taproot in grasses? there is no taproot in the farm right image is that it is a monocot, hence they dont have secondary growth plants have longer root to get water and shorter root to get nutrients http://www.ualr.edu/botany/ Mineral Nutrition Root-Soil Interactions • Root system – Density • Regions rich in moisture and mineral nutrients have greatest root growth* • Root length density = cm of roots / cm3 of soil – RLD of 1-2 cm/cm3 is adequate • Density highest near surface, decreases with depth – Species and environment dependent Mineral Nutrition Root-Soil Interactions • Root system – Density • Regions rich in moisture and mineral nutrients have greatest root growth • Root length density = cm of roots / cm3 of soil* – RLD of 1-2 cm/cm3 is adequate • Density highest near surface, decreases with depth – Species and environment dependent Mineral Nutrition Root-Soil Interactions...
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