Browse on keywords: moisture OR WA
Search results on 02/18/19
3900. Lindstrom, M.J., F.E. Koehler, and R.I. Papendick. 1974. Tillage effects on fallow water storage in the eastern Washington dryland region.. Agron. J. 66:312-316.
206. Allmaras, R.R.. 1967. Soil water storage as affected by infiltration and evaporation in relation to tillage-induced soil structure. p. 37-43.. IN: Tillage for Greater Crop Production (Conf. Proc.).
Soil water storage as affected by infiltration and evaporation in relation to tillage-induced soil structure.
3240. Widtsoe, J.A.. 1908. The storage of winter precipitation in soils.. Utah Agr. Expt. Sta. Bulletin 104, Utah State Univ., Logan, UT.
The storage of winter precipitation was compared between an irrigated farm and six non-irrigated farms in Utah, to determine what proportion of winter precipitation is actually stored in the soil. In the top eight feet, average maximum amounts of winter precipitation stored for five years on an irrigated farm was 82% and for three years on non-irrigated farms the winter precipitation stored was 62%. It was concluded that enough water for dryland farming will be stored in the soils when fallowing is practiced every other summer.
3865. Leggett, G.E.. 1959. Relationships between wheat yield, available moisture and available nitrogen in eastern Washington dryland areas.. WA Agr. Expt. Sta. Bull. #609.
The purpose of this work is to demonstrate the relationships which exist between (1) available moisture and wheat yield and (2) available nitrogen and wheat yield. Using these relationships, it is possible to calculate the amount of fertilizer nitrogen necessary to obtain maximum wheat yield if the supply of available nitrogen in the soil and the amount of moisture available for the crop can be estimated. The results of 90 fertility experiments conducted on dryland wheat in eastern Washington during the period 1953-1957 were used to determine the relationship between wheat yield and available moisture. The results of 62 experiements were used to determine the relationship between wheat yields and available nitrogen. It is possible to calculate nitrogen fertilize recommendations from the results of soil tests for nitrate-nitrogen and available soil moisture by use of these relationships.
4876. Noori-Fard, F. and F.E. Bolton. 1982. The effect of water injection on stand establishment components.. OR Agr. Expt. Sta. Special Report 661, p.16-18.
Dry seedzone conditions are generally more prevalent with no-till cropping systems, but they also occur in stubble mulch cropping systems. Planting into inadequate seedzone moisture will result in delayed crop emergence and reduced stand density. Field studies were conducted to examine the effect of water injection with the seed on stand establishment and its related components. Water injection significantly increased the emergence and developement of winter wheat planted into a dry seedzone. During three field seasons, water injection with the seed has consistently demonstrated its effectiveness as an aid to plant emergence and stand development.
5253. Pikul, J.L. Jr., J.F. Zuzel and R.N. Greenwalt. 1988. Tillage impacts on water infiltration.. OR Agr. Expt. Sta. Special Report 827, p.46.
5517. Ramig, R.E.. 1989. personal communication. Columbia Basin Agr. Research Center, Pendleton, OR 97801.
About 70% of precipitation is stored in the soil from Sept. 1-Mar. 1 at Pendleton, OR, and from Sept. 1-Apr. 1 at Moro, OR. This would be for the first winter after harvest in a crop-fallow system. The following summer, on fallow ground, from Mar. 1-Nov. 1, all precipitation that occurs is lost plus 20% of the stored moisture, in the <14" rainfall zone on deep soils. For the PNW as a whole, fallow storage efficiency is about 50%. It is about 25% in Nebraska, and 15% in North Dakota. In north central OR, under standing stubble, there is 70% storage in an 8' profile in the first winter. Precipitation averages about 16.5" per year. Over the second winter, about 50% of the moisture is stored under the planted wheat crop. Ramig recommends a double fallow for set-aside ground on Ritzville soils. He points out the need for a winter legume that can grow between 35-50 degrees F, provide cover, and fix nitrogen. In the transition zone, water storage values for those soils as listed in the Soil Survey are higher than the actual field values determined.
5558. Ramig, R.E. and L.G. Ekin. 1984. Effect of stubble management in a wheat-fallow rotation on water conservation and storage in eastern Oregon.. OR Agr. Expt. Sta. Special Report 713, p. 30-33.
5566. Ramig, R.E. and L.G. Ekin. 1976. Conservation tillage effects on water storage and crop yield in Walla Walla and Ritzville soils.. OR Agr. Expt. Sta. Special Report 459, p.15.
5585. Ramig, R.E. and L.G. Ekin. 1987. Fallow systems for semiarid eastern Oregon and Washington.. OR Agr. Expt. Sta. Special Report 797, p.34.