Efficiency of two nitrogen fertilizers applied in different phenological stages on a winter bread wheat (Triticum aestivum L.)
1993
Mellado Z, Mario (Instituto de Investigaciones Agropecuarias, Chillan (Chile). Estacion Experimental Quilamapu)
A field experiment was carried out during four successive crop seasons, 1988-1991, at the Quilamapu Experiment Station (INIA), Chile, to evaluate the efficiency of nitrogen use by a winter bread wheat, when this nutrient was applied as Chilean nitrate or as urea, at different phenological stages during growth cycle. The trials were set up under irrigation, in a split plot design, involving application date as treatments and the nitrogen fertilizers as subtreatments. Both fertilizers were broadcasted in a single application of 150 kg N/ha per subtreatment, on the soil surface every 30 days since sowing until heading. Evaluations were: grain yield, yield components, phytomass and nitrogen content of the grain and straw. The most important conclusions are: - Chilean nitrate and urea applied at different phenological stages in a winter bread wheat, had the same performance. - Early nitrogen applications from sowing to initial tillering, or late nitrogen application (spike emergence) negatively affect the grain production, N extraction and N recovery by the wheat plant. - The highest values of grain yield and grain production efficiency were obtained when all the N rate was applied between tillering and jointing. - Total rainfall between sowing time and the fertilizer application dates related to the leaching of nitrogen, might explain the variations in the nitrogen recovery capacity by the wheat plant
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Instituto de Investigaciones Agropecuarias