Effects of phosphorus nutrition on tiller emergence in wheat

摘要: Phosphorus (P) deficiency limits the yield of wheat, particularly by reducing number ears per unit area because a poor tiller emergence. The objectives this work were to (i) determine whether emergence under low phosphorus availability is function assimilates for growth or direct result P availability, (ii) attempt establish quantitative relation between an index in plant and effects on emergence, (iii) provide better understanding mechanisms involved field-grown wheat. Wheat (Triticum aestivum L., cv. INTA Oasis), was grown field drip irrigation typic Argiudol, (5.5 μg g-1 soil Bray & Kurtz I) Balcarce, Argentina. Treatments consisted combination three levels fertilization 0, 60 200 kg P2O5 ha-1, two assimilate control (non-shaded) 65% reduction incident irradiance from seedling until end tillering (shaded). treatments significantly modified pattern development plants. Shading reduced concentration water-soluble carbohydrates leaves stems. Leaf photosynthetic rate at saturating deficiency, but not affected shading. At shoot concentrations less than 4.2 g kg-1 heterogeneity population increased with respect plants bearing certain tiller. 1.7 ceased completely. directly altered normal slowing main stem (i.e. increasing phyllochron), maximum each