No‐Tillage Cropping Systems Can Replace Traditional Summer Fallow in North‐Central Oregon

Machado, Stephen; Pritchett, Larry; Petrie, S. E.

doi:10.2134/agronj14.0511

Cited by 25 publications

(22 citation statements)

References 46 publications

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“…In particular, a reduction of fallow frequency could be practiced under lowprecipitation conditions without penalizing WW yields as long as fallow preceded WW. Our results also support previous results at individual sites in Moro, OR (Machado et al, 2015) and Lind, WA (Schillinger, 2016), who determined that intensified rotations were agronomically competitive to a traditional WWfallow rotation which practiced fallow every 3 years but prior to WW.…”

Section: Crop Intensificationsupporting

confidence: 90%

“…In the iPNW, research has indicated that continuous spring cropping may be agronomically feasible Bewick et al, 2008), even with less precipitation than we observed in our study (Machado et al, 2015). However, in six cropping seasons previously conducted at Ralston, the wheat-fallow system yielded 25% more than continuous spring wheat (Young et al, 2015).…”

Section: Cropping System Productivity In Continuous Croppingcontrasting

confidence: 61%

“…A long-term experiment was initiated in 2003 at the Oregon State University Sherman Station near Moro, OR, to evaluate traditional winter wheat-summer fallow cropping system under conservation tillage, intensified, and diversified cropping systems using no-till practices (Machado et al, 2015). Average annual precipitation at the site is 289 mm.…”

Section: Moro Ormentioning

confidence: 99%

“…All phases of the rotations were present every year. Details on management are reported by Machado et al (2015).…”

Section: Moro Ormentioning

confidence: 99%

“…In particular, chemical fallow does not provide gains in soil water storage efficiency (Schillinger and Bolton, 1993) over conservation-tillage fallow. Nevertheless, chemical fallow has been reported to be, overall, just as efficient as tilled fallow in retaining soil moisture throughout the 13 month fallow period in areas receiving more than 290 mm annual precipitation (Schillinger, unpublished;Machado et al, 2015). Previous research in the region has also demonstrated that conservation practices can be more profitable if weeds are properly managed, and conservation production systems may incorporate multi-faceted approaches to manage weeds in the low precipitation zone (Young, 2004).…”

Section: Crop Intensificationmentioning

confidence: 99%

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Impact of Climate Change Adaptation Strategies on Winter Wheat and Cropping System Performance across Precipitation Gradients in the Inland Pacific Northwest, USA

Maaz

Schillinger

Machado

et al. 2017

Front. Environ. Sci.

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Ecological instability and low resource use efficiencies are concerns for the long-term productivity of conventional cereal monoculture systems, particularly those threatened by projected climate change. Crop intensification, diversification, reduced tillage, and variable N management are among strategies proposed to mitigate and adapt to climate shifts in the inland Pacific Northwest (iPNW). Our objectives were to assess these strategies across iPNW agroecological zones and time for their impacts on (1) winter wheat (WW) (Triticum aestivum L.) productivity, (2) crop sequence productivity, and (3) N fertilizer use efficiency. Region-wide analysis indicated that WW yields increased with increasing annual precipitation, prior to maximizing at 520 mm yr −1 and subsequently declining when annual precipitation was not adjusted for available soil water holding capacity. While fallow periods were effective at mitigating low nitrogen (N) fertilization efficiencies under low precipitation, efficiencies declined as annual precipitation exceeded 500 mm yr −1 . Variability in the response of WW yields to annual precipitation and N fertilization among locations and within sites supports precision N management implementation across the region. In years receiving <350 mm precipitation yr −1 , WW yields declined when preceded by crops rather than summer fallow. Nevertheless, WW yields were greater when preceded by pulses and oilseeds rather than wheat across a range of yield potentials, and when under conservation tillage practices at low yield potentials. Despite the yield penalty associated with eliminating fallow prior to WW, cropping system level productivity was not affected by intensification, diversification, or conservation tillage. However, increased fertilizer N inputs, lower fertilizer N use efficiencies, and more yield variance may offset and limit the economic feasibility of intensified and diversified cropping systems.

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Section: Crop Intensificationsupporting

confidence: 90%