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Organic & Integrated Tree Fruit Production

Thursday, July 19, 2018

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Search results on 07/19/18

3288. Pan, W.L. and A.G. Hopkins. 1991. Plant development, and N and P use of winter barley. I Evidence of water stress-induced P deficiency in an eroded toposequence.. Plant Soil 135:9-19.
Winter barley was grown at three landscape positions of a representative toposequence in the Palouse region to identify soil factors which limit plant development and nutrient use efficiency in the eroded slope positions. Subsurface P was severely deficient at eroded ridgetop and sideslope positions. Drying of surface soil during the growing season prevented roots from using much surface applied P. This moisture stress-induced P deficiency suggests that deep placement of P is needed to build subsoil P levels for enhanced productivity on these eroded sites.

3259. Pan, W.L., B.A. TIllman, and S.E. Ullrich. 1991. Ammonium and nitrate uptake by barley genotypes in diurnally fluctuating root temperatures simulating till and no-till conditions.. Plant Soil 135:1-8.
The morphological development and N uptake patterns of European and PNW spring barley cultivars were compared under conditions simulating soil temperature differences between till and no-till conditions observed during early spring in eastern WA. All genotypes absorbed more ammonium than nitrate. Overall, the data indicate that lower maximum daytime temperatures of the soil layer likely account for a significant portion of the growth reductions and lower N uptake observed in no-till systems.

9698. Nuttal, W.F., H.G. Zandstra and K.E. Bowren. 1970. Exchangeable ammonium- and nitrate-nitrogen related to yields of Conquest barely grown as second or third crop after fallow in NE Saskatchewan.. Can. J. Soil Science 51:371-377..
Exchangeable ammonium- plus nitrate-nitrogen measured to depth of 60 cm in 18 stubble fields during 1967, 1968 and 1969 in Black, Dark Gray and Gray Wooded soils of northeastern Saskatchewan was inversely related by regression analyses to yield increases of Conquest barely. The mean protein content of the grain was significantly related by regression to nitrogen soil tests. Increased yield from nitrogen fertilization resulted in a decrease in phosphorus content of the grain.

10406. Pan, W.L. and A.G. Hopkins. 1991. Plant development, and N and P use of winter barley. II. Responses to tillage and N management across eroded toposequences.. Plant Soil 135:21-29.
Winter barley was grown at three landscape positions of a representative toposequence in the Palouse region. Direct drilling (no-till) into crop residues increased yields by 16% over conventional tillage at an eroded ridgetop position, despite early season growth inhibition. Tillage system had no effect on grain production at other landscape positions that featured higher overall yields. Short-term benefits of no-till systems may be most evident at slope positions where water use is most limited.

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