AGR 2320 Lecture Notes - Lecture 31: Vermiculite, Illite, Cash Crop
23 Nov 2016
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Agr 2320 lecture 31 p-fertilizer & k. The type of molecule produce affects the kind of precipitate that is formed. Plant uptake and the mobility of it ph and p availability (john lauzon, 2016) The amount of phosphorous available increases as ph decreases: the phosphorous has increased mobility. Erosion: only 20-100g/ha/yr is lost through erosion, very little. Erosion of sediments with high p content into surface water bodies (eutrofication of surface water bodies) High p content arises from application of p in excess of crop requirements (inorganic fertilizer, manure) Algae blooms & phytotoxins are harmful to humans: through touch & drinking. All kinds of agriculture lose phosphorous and you need to replenish it. Illite is held together by k: when add potassium fertilizer to vermiculite, k is sucked in and you get something similar to illite, plants don"t use this source of potassium. Finite resource: but have a lot of it. Potash is found over 1 km underground.
