Archives of Agronomy and Soil Science, ( ISI ), Volume (63), No (8), Year (2017-1) , Pages (1150-1162)

Title : ( Tillage and N application effects on crop yield, N uptake and soil properties in a corn-based rotation )

Authors: Sayyed Shahaboddin Moinoddini , Alireza Koocheki , Mehdi Nassiri Mahallati , A. Borzooei ,

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Abstract

The objective of this study was to determine the influence of tillage methods (conventional tillage (CT) and minimum tillage (MT)) and N rates (0, 50, 150, 250 kg N ha−1) on crop yield, N uptake and soil organic carbon (SOC), bulk density (BD), total N (TN), electrical conductivity (EC), pH and soil nutrient contents on a clay-loam near Hashtgerd, Iran. A successive corn-based rotation (2012–2014) was conducted as a split-plot in a randomized complete block design in which tillage methods were considered as main plots, and N rates as subplots. Tillage had no significant effect on corn 2012 and canola 2012–2013 grain yields. CT and MT systems showed different critical N rates to reach their maximum grain yield in corn (2013) and wheat (2013–2014). MT system required more N application to reach its maximum grain yield. Tillage × N rate effect on none of the soil properties was significant. Tillage had no significant (P ≤ 0.05) effect on soil pH, BD, TN and SOC. However, soil EC of 0–5 cm depth in MT system was higher than CT system by 64%. MT system under higher N application could increase corn grain yield, but on the other hand probably adversely changes soil chemical properties.

Keywords

, Exchangeable K, minimum tillage, soil N, soil organic carbon