گزارش نهایی طرح حد بحرانی عناصر غذایی فسفر و پتاسیم در خاکهای زیر کشت لوبیا در استان مرکزی

Soil test has important role in plant nutrition management to obtain economical agriculture system. Recommendation soil testing results arr reigenal' therefore this tests and calibrations must be carried out necessarily for each specific climate condition. Bean Phaseolus vulgaris L.) is one of the most widly grown in markazi province and has high nutrition value for human.Lack of any information about potassium and phosphorus critical levels and regional calibration' this study was canducted in markazi province. Soil surface samples including twenty three for phophorus and twenty xix for potassium experiments' with wide rang of soil properties and p* k concentration were collected from different zone of province and prepeared for greenhouse cultivation. Greenhouse experiment was conducted as complete randomized design with three replications for each elements. Treatments were including two levels of potassium (CM 00 mg k kg'' soil) and phosphorus (0'50 mg p kg"' soil). At the end of vegetative stage plants harvested and prepeard fof laboratory analysis. Analyze of variance results showed that effect of soil and fertilizer were significant on dry matter weighet' and p' k concentration and uptake. Inn-action effect of soil and fertilizer was significant on three prameters in phosphorus experiment but this effect only significant on potassium concentration. Results of Duncan multiple range test showed that fertilizers application had significant difference on dry matter weight concentration and plant uptake of phosphorus and potassium, Critical level determined 13 mg p kg"' soil for phosphorus (olson method) and 150 mg k kg"' soil for potassium (ammonium acetate method) with cate - nelson graphic method. Dry mather weight had significant correlation with available k' cation exehang capacity ' clay and sand but k concentration and uptake showed significant correlation with k available and organic carbon percentage. In phosphorus experiment dry matter weight had significant correlation with phosphorus available and organic carbon percentage. Phosphorus concentration was correlated significantly with sand and organic carbon percentage but phosphorus uptake had significant correlation with electrical conductivity' clay* sand and organic carbon percentage. Key word: Bean, Phosphorus, potassium. Critical level.

Keywords:

لوبیا , فسفر , پتاسیم , عناصر غذایی , کشت , حد بحرانی , استان مرکزی