Naslov
Influence of nitrogen fertilization and plant density on yield and nitrogen use efficiency of the potato (Solanum tuberosum L.)

Autori
Poljak, Milan ; Lazarević, Boris ; Horvat, Tea ; Karažija, Tomislav

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Zbornik radova 46. hrvatskog i 6. međunarodnog simpozioja agronoma / Pospišil M. - Zagreb : Agronomski fakultet Sveučilišta u Zagrebu, 2011, 667-671

ISBN
978-953-6135-71-4

Skup
46. hrvatski i 6. međunarodni simpozij agronoma

Mjesto i datum
Opatija, Hrvatska, 14.02.2011. - 18.02.2011

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
potato; N rate; plant density; yield quality; N use efficiency characteristics

Sažetak
The objective of this study was to evaluate influence of different nitrogen rate and in-row seed spacing on yield, tuber size distribution and nitrogen use efficiency characteristics. Field experiment was conducted at the Gospić on private farm during 2009 growth season. The experiment used a split plot arrangement of treatments in randomized complete block design in four repetitions. Main plots were N supply rates (0, 50, 100, 150, 200 i 250 kg N ha-1). Sub plots were in-row seed space (25, 30 and 35 cm). Respectively to control, total tuber yield increased by increased N rate up to 150 kg N ha-1 (20.5 t ha-1). As N rate increased ratio of small tubers decreased and the lowest ratio of small tubers (9.86%) was obtained at 150 kg N ha-1. The total tuber yield decreased for 22% as in-row space increased from 25 to 35 cm, but ratio of medium and large tubers increased marginally. The increased N rate decreased nitrogen use efficiency (NUE), nitrogen utilization efficiency (NUtE) and nitrogen uptake efficiency (NUpE) significantly respectively to control. Varying in-row seed spacing from 25 cm to 35 cm decreased significantly N use efficiency characteristics (NUE, NUtE and NUpE) too. Because there is no the interaction effect it is necessary to continue investigation to find out the best combination N rate x plant density for potato growers.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

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