Effects of 24 Years of Conservation Tillage Systems on Soil Organic Carbon and Soil Productivity

Table 1

Effect of different tillage treatments on plant residue after planting and soil loss at Dixon Springs. Odd years have soybean residue and even years have corn residue.

Tillage	Residue present from previous crop (% cover)									Soil loss^#
	1996	1997	1998	1999	2005	2006	2007	2011	2012	(Mg ha^−1)
No-till	91a*	75a	95a	73a	85a	90a	78a	74a	88a	8c
Chisel plow	21b	18b	29b	21b	18b	28b	24b	20b	28b	20b
Moldboard plow	6c	6c	17c	5c	5c	10c	8c	6c	9c	30a

*For each year means in a same column followed by the same letter is not significantly different at the 𝑃=0.05 probability level.
^#Soil loss is calculated by Universal Soil Loss Equation (USLE) and Revised Universal Soil Loss Equation (RUSLE2).