Browse on keywords: erosion P
Search results on 10/21/18
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.
3499. Kaiser, V.G., W.W. Pawson, M.H. Groenveld and O.L. Brough. 1954. Soil loss on wheat farms in the Palouse wheat - pea area, 1952-53. WA Agr. Expt. Sta. Circ. #255.
Average soil loss on fields seeded to winter wheat was 8 T/a on winter wheat after summer fallow it was 18 T/ac. Various suggested ways of conservation farming: 1) crop rotation; 2) reduction of summer fallow; 3) not burning stubble; 4) use of fertilizer; 5) stubble mulch; 6) early seeding of winter wheat. T: Soil loss per type of winter crop. Soil loss on wheat after summer fallow. Soil loss per slope of land.
35. Anon.. 1949. Grasses and legumes for soil conservation in the PNW.. .
An excellent treatment of over 60 species - detailed descriptions. T: maps and photos.
231. Allmaras, R.R., C.L. Douglas and K. Ward. 1976. More infiltration, less runoff and evaporation.. OR Agr. Expt. Sta. Special Report 459.
765. Benson, V., W. Goldstein, D. Young, J. Williams, and C. Jones. 1988. Impacts of cropping practices on nitrogen use and movement.. Proc. Intl. Conf. on Dryland Farming.
Conventional and PALS practices were used as inputs for the EPIC model to simulate the effects of the systems over 108 years on an Athena soil. Total erosion over 108 yr under PALS was 40% less than the conventional system. Nitrogen loss through water was 25% less under PALS than conventional. Percolation loss of N was zero for both systems. Neither system had significant increase or decrease in yields after 108 yr of erosion.
1819. Elliott, L.F. (ed.). 1987. STEEP - Conservation concepts and accomplishments.. Washington State Univ. Publ., 662pp..
A compilation of 48 papers covering: tillage and plant maagement; erosion and runoff predictions; plant design; pest management; socio-economic; integrated systems; technology transfer for cropping systems; 22 technical notes. T: many
1149. Busacca, A.J., D.K. McCool, R.I. Papendick and D.L. Young. 1985. Dynamic impacts of erosion processes on productivity of soils in the Palouse. p. 152-169.. IN: ASAE. Erosion and soil productivity. (Conf. Proc., Dec. 10-11, 1984).
Tillage erosion on hilltops for a single plowing results in about a 29 T/ha loss, which is similar to that of water erosion. At these rates all of the topsoil will be removed from the Naff, Garfield, and Risbeck soils over a 50 year period; 1/3 - 2/3 of the topsoil will be removed from the Walla Walla, Palouse, and Thatuna soils over the same 50 year period. Crop yields may be reduced by 25%. Assuming present technology, yields at zero topsoil will be 2.4 T/ha and 1.8 T/ha for Naff soil on Class III and IV sites respectively. T: Water erosion estimates. Predicted wheat yields for varying topsoil depths by soil series and capability class. Topsoil depth-yield response functions.
1086. Brooks, R.O. and E.L. Michalson. 1983. An evaluation of BMP's in the Cow Creek watershed of Latah County, Idaho.. ID Agr. Expt. Sta. Research Bull. #127.
Eight BMP's were evaluated. Major farm income loss occurred when soil erosion was reduced below 6 T/ac./yr. This required minimum tillage and a rotation change from wheat-barley-fallow to wheat-barley-peas.
1219. Caplan, A.J.. 1986. Cost return and relative soil loss comparisons of alternative tillage systems.. MS Thesis.
Minimum tillage is less expensive than conventional. No-till is most expensive due to high chemical inputs. In the low precipitation zone, minimum till was 1.19 times less expenxive than conventional. Annual peas/wheat in high precip. zone was 1.5 times less expensive with min-till than conventional.
2928. Idaho Agr. Expt. Sta.. 1949. Annual report.. ID Agr. Expt. Sta. Bull. #276.
Sweetclover maintained OM levels, slight loss in W-P; N fertilizer reduced OM losses where straw was removed.