FNH 330 Lecture Notes - Lecture 2: Silt, Late Harvest Wine, Pectinase
15 Dec 2017
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Terrior: viticulture (management, geographical factors (soil) Soil: marginal = poor = impede root growth, doesn"t drain, low whc and nhc, nutrients = n, p, k, mg, ca, etc, types. Loam mixture clay, silt and sand. Clay high whc and nhc;greatly slows drainage. Organic high whc and nhc; moderately slows drainage. Climates: mediterranean mild, wet winters; dry, hot summer. Disadvantage: low h2o, sun scaling, low acid/aroma: continental cold winter, hot summer. Disadvantages: winter cold injury, disease if humid: maritime cool winter, summer, wet, cool-climate short season, cold winter, variable summer, others. Cold mid latitude desert rainshaddow effect, more sunshine. Desert adjavent to mediteranean access to irrigation. Two most limiting factors on grapes: temperature, rainfall. Optimal mean temp: reds = 21 deg, whites = 15 deg. Wind: inhibits photosynthesis and delay ripening. Heat summation units: compare these units between months. Riesling grapes early harvest = green apple; late harvest = apricot/peach. Need at least 200g/l sugar, otherwise chaptalization.
