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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 71, No. 3, 2011, pp. 437-444
Bioline Code: cj11055
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 71, No. 3, 2011, pp. 437-444

 en EFFECT OF NITROGEN RATES AND SPLIT NITROGEN FERTILIZATION ON GRAIN YIELD AND ITS COMPONENTS IN FLOODED RICE
Hirzel, Juan; Pedreros, Alberto & Cordero, Karla

Abstract

Nutritional management in rice ( Oryza sativa check for this species in other resources L.) crops is mainly associated with N fertilization, which is difficult to adjust in field conditions due to variations in soil type and climatic conditions. Between 28 000 and 46 000 ha per year is dedicated to rice production in Chile and profits depend on fertilization. A field experiment determine the effect of N rates and split N fertilization on grain yield and its components was carried out in two locations during two consecutive seasons (2007 to 2009), where five N rates and five split N fertilizations were evaluated. The locations were in Parral (36°2' S; 72°08' W, Vertisol) and San Carlos (36°19' S; 71°59' W, Inceptisol), with N rates of 80, 100, 120, 140, and 160 kg ha-1 applied in different development stages, such as sowing, tillering, panicle initiation, and boot. Results indicate an important seasonal effect on grain yield. Yield increased with N rates higher than 120 and 140 kg ha-1 in San Carlos and Parral, respectively. Moreover, higher productivity with split N fertilization was (1) 33% of N at sowing, 33% at tillering, and 34% at panicle initiation or (2) 50% of N at sowing and 50% at panicle initiation. Yield components with the highest effect on productivity were affected by the evaluated split N. On the other hand, higher N rates increased the percentage of both stained and sterile grains per panicle.

Keywords
Irrigated rice, nitrogen management, rice productivity, Oryza sativa

 
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