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Land drainage

W. L. Powers · Chapman & Hall, ltd.

270 sayfa · 1922

Drainage / Drenagem (Agricultura)

CiltLand DrainageW. L. Powers

Land Drainage

W. L. Powers · Read Books

288 sayfa · 2007

Kategori yok

Soil moistureIrrigation and soil-moisture investigations in western OregonW. L. Powers

Irrigation and soil-moisture investigations in western Oregon

W. L. Powers · Oregon Agricultural College Experiment Station

110 sayfa · 1915

Irrigation / Research / Soil moisture

IrrigationReport on the agricultural and economic phases of the Jordan Valley Irrigation District to the State Reclamation Commission of OregonW. L. Powers

Report on the agricultural and economic phases of the Jordan Valley Irrigation District to the State Reclamation Commission of Oregon

W. L. Powers · The Authors

62 sayfa · 1931

Economic conditions / Irrigation

ResearchTwenty-five years of supplemental irrigation investigations in Willamette ValleyW. L. Powers

Twenty-five years of supplemental irrigation investigations in Willamette Valley

W. L. Powers · Agricultural Experiment Station, Oregon State Agricultural College

30 sayfa · 1932

Irrigation / Research

Waterlogging (Soils)Drainage and improvement of white land and similar wet landW. L. Powers

Drainage and improvement of white land and similar wet land

W. L. Powers · Oregon Agricultural College, Experiment Station

16 sayfa · 1923

Drainage / Soil moisture / Waterlogging (Soils)

Water dutiesDuty of water in irrigationW. L. Powers

Duty of water in irrigation

W. L. Powers · Oregon Agricultural College Experiment Station

20 sayfa · 1920

Water duties

IrrigationUso económico del agua de riegoW. L. Powers

Uso económico del agua de riego

W. L. Powers · Tip. Garrido

87 sayfa · 1944

Irrigation

IrrigationIrrigation of alfalfaW. L. Powers

Irrigation of alfalfa

W. L. Powers · Oregon Agricultural College Experiment Station

36 sayfa · 1922

Alfalfa / Irrigation

Sulphur contentSulfur in relation to soil fertilityW. L. Powers

Sulfur in relation to soil fertility

W. L. Powers · Oregon Agricultural College Experiment Station

45 sayfa · 1923

Soils / Sulphur content

DrainageDrainage practices for OregonW. L. Powers

Drainage practices for Oregon

W. L. Powers · Agricultural Experiment Station, Oregon State College

35 sayfa · 1950

Drainage

IrrigationThe drainage of irrigated landsW. L. Powers

The drainage of irrigated lands

W. L. Powers · Oregon Agricultural College, Extension Service

Sayfa sayısı yok · 1922

Drainage / Irrigation

SoilsComposition, rating, and conservation of Willamette Valley soilsW. L. Powers

Composition, rating, and conservation of Willamette Valley soils

W. L. Powers · Oregon State System of Higher Education, Agricultural Experiment Station, Oregon State College

38 sayfa · 1939

Soils

Reclamation of landMethods of preparing land and applying irrigation waterW. L. Powers

Methods of preparing land and applying irrigation water

W. L. Powers · Oregon Agricultural College, Extension Service

Sayfa sayısı yok · 1917

Irrigation / Reclamation of land

DrainageThe drainage of "white land" and other wet lands in OregonW. L. Powers

The drainage of "white land" and other wet lands in Oregon

W. L. Powers · Oregon Agricultural College Experiment Station

80 sayfa · 1916

Drainage

IrrigationFundamental principles of modern irrigation practiceW. L. Powers

Fundamental principles of modern irrigation practice

W. L. Powers · Oregon Agricultural College, Extension Service

Sayfa sayısı yok

Irrigation

SoilsContributions of soil science to the welfare of OregonW. L. Powers

Contributions of soil science to the welfare of Oregon

W. L. Powers · Oregon Agricultural Experiment Station, Oregon State College

Sayfa sayısı yok · 1940

Soil science / Soils

Waterlogging (Soils)Drainage and improvement of wet landW. L. Powers

Drainage and improvement of wet land

W. L. Powers · Agricultural Experiment Station, Oregon State Agricultural College

19 sayfa · 1931

Drainage / Soil moisture / Waterlogging (Soils)

IrrigationSupplemental irrigation for the Willamette valleyW. L. Powers

Supplemental irrigation for the Willamette valley

W. L. Powers · Oregon Agricultural College, Experiment Station

Sayfa sayısı yok · 1924

Irrigation

SoilsComposition and rating of Willamette Valley soilsW. L. Powers

Composition and rating of Willamette Valley soils

W. L. Powers · Oregon Agricultural Experiment Station, Dept. of Soils & Dept. of Agricultural Chemistry

11 sayfa · 1940

Analysis / Soils

Soil fertilityMaintaining fertility of Grande Ronde Valley soilsW. L. Powers

Maintaining fertility of Grande Ronde Valley soils

W. L. Powers · Agricultural Experiment Station, Oregon State Agricultural College

23 sayfa · 1933

Soil fertility

DrainageFarm drainageW. L. Powers

Farm drainage

W. L. Powers · Oregon Agricultural College Experiment Station

47 sayfa · 1921

Drainage

SoilsIdentification and productivity of western Oregon soil typesW. L. Powers

Identification and productivity of western Oregon soil types

W. L. Powers · Agricultural Experiment Station, Oregon State College

29 sayfa · 1948

Classification / Soil productivity / Soils

Irrigation, United States: NorthwestIrrigation practiceW. L. Powers

Irrigation practice

W. L. Powers · Yayınevi bilinmiyor

68 sayfa · 1912

Irrigation / Irrigation, United States: Northwest

Farm manureCare, use and economic value of farm manureW. L. Powers

Care, use and economic value of farm manure

W. L. Powers · Agricultural Experiment Station, Oregon State Agricultural College

15 sayfa · 1931

Farm manure

Soil fertilityCrop rotation and soil fertilityW. L. Powers

Crop rotation and soil fertility

W. L. Powers · Oregon Agricultural College, Experiment Station

12 sayfa · 1923

Crop rotation / Soil fertility

SoilsSoils of Chehalis series and their utilizationW. L. Powers

Soils of Chehalis series and their utilization

W. L. Powers · Agricultural Experiment Station, Oregon State Agricultural College

19 sayfa · 1932

Soils

SoilsSoils of Willamette series and their utilizationW. L. Powers

Soils of Willamette series and their utilization

W. L. Powers · Agricultural Experiment Station, Oregon State Agricultural College

28 sayfa · 1928

Soils

Reclamation of landPreliminary report on the improvement of marsh lands in western OregonW. L. Powers

Preliminary report on the improvement of marsh lands in western Oregon

W. L. Powers · Oregon Agricultural College Experiment Station

31 sayfa · 1919

Marshes / Reclamation of land

IrrigationThe value of supplemental irrigation in Willamette ValleyW. L. Powers

The value of supplemental irrigation in Willamette Valley

W. L. Powers · Oregon State System of Higher Education, Agricultural Experiment Station, Oregon State College

31 sayfa · 1946

Irrigation