Browse on keywords: organic matter pH
Search results on 05/18/13
2153. Gaur, A.C., R.S. Mathur and K.V. Sadasivam. 1980. Effect of organic materials and phosphate-dissolving culture on the crop yield.. Indian J. Agron., 25(3):501-503.
The seed of crops were inoculated with phosphate-solubilising culture (Pseudomonas striata) and (Aspergillus awamori). Rock phosphate application along with P-solubilising culture and full nitrogen significantly augmented both the grain and straw yields of wheat crop.
2617. Hill, K.W.. 1954. Wheat yields and soil fertility on the Canadian prairies after a half century of farming.. Soil Sci. Soc. Am. Proc. 18:182-184.
T: soil properties X rotation; wheat yields X time
5065. Patten, A.G.. 1982. Comparison of nitrogen and phosphorous flows on an organic and conventional farm.. M.S. Thesis, Dept. of Agronomy and Soils, WSU, Pullman, WA.
Two adjacent farms, one organically managed and the other conventionally managed, located in the Palouse region of eastern WA, were studied for 2 years. Soil organic matter, total N, extractable P, and extractable K tended to be higher in the top 30 cm of soil from the organic farm. Mineral nitrogen in the top 30 cm of soil from the conventional farm was higher than or equal to that of the organic farm. Average long-term changes calculated in soil N and P pools resulted in substantial deficits of 44 and 14 kg/ha/yr, respectively, for the organic farm and 23 and 5 kg/ha/yr for the conventional farm. However, nutrients deficits were not reflected in lower soil N and P levels in the plot area tested on the organic farm as compared to the plot area on the conventional farm.
5122. Pesik, J., and L. Kozak. 1982. Possibilities of compensating unfavorable influence of less suitable forecrops in winter wheat.. Rostlina Vyroba, 28(4):381-388.
The strongest influence on yield was exerted by forecrop. The increased N-fertilization or organic fertilization decreased the yield difference in rotations with a higher cereal concentration, but it did not compensate the negative influence of less suitable forecrops on the yield level of unfertilized clover crops. The long-term application of organic matter resulted in the decrease of pH, however the amount of available nutrients (P, K, Mg) and humus percentage increased.
6001. Russell, J.S. and C.H. Williams. 1982. Biogeochemical interactions of carbon, nitrogen, sulfur, and phosphorus in Australian agroecosystems.. IN: J.R. Freney and I.E. Galbally (eds.). Cycling of C,N,S, and P in terrestrial/aquatic ecosystems..
An excellent review article looking at nutrient cycling and gains and losses over time under different agricultural management. Estimates that over 3 million tons C are tied up in soil organic matter additions each year in Australian farmland. SOM levels are higher now than the native condition under systems that have used a legume pasture in the rotation. There was a generally downward trend in the soil C:N over the first 25 yr of OM accumulation. A WWPP rotation slightly increased SOM, while WWWP decreased it slightly, and fallow systems decreased it significantly. Increases in SOM increased the water-stable aggregates in the soil and improved infiltration. Leguminous pastures had an acidifying effect on the underlying soil.