SOIL ECOLOGY IN SUSTAINABLE AGRICULTURAL SYSTEMS - CHAPTER 2 ppsx

... can find more protective niches in fine-textured soils than in coarse-textured soils, leading to a higher grazing pressure in the coarse-textured soils (Postma, 1989) and a stronger increase in ... Relative Increase in C Mineralization after Drying, Fine-Sieving, and Rewetting of Soil Samples in Comparison with Drying/Rewetting Only (%) in Sandy, Loamy, and Clay Grassland So...

Ngày tải lên: 11/08/2014, 15:20

... Ranges (cm) Soil water fraction CONVB ’85 CONVB ’87 CONVB ’88 INTA ’85 INTA ’87 INTA ’88 –100 to 2, 500 0 .23 2 0 .22 2 0 .23 4 0.164 0.195 0.159 –100 to –16,000 0 .28 3 0 .28 0 0 .28 6 0 .25 4 0 .26 8 0 .25 7 From ... Environ., 51 :21 – 42. Brussaard, L., 1994. The ecology of soil organisms in reduced input farming, in Soil Biota Management in Sustainable Farming Systems, P...

Ngày tải lên: 11/08/2014, 15:20

... Water-stable aggregates a,b No-tillage Conventional tillage Tillage (p <0.05)Control Fungicide Control Fungicide > ;2, 000 µm 65.5 42. 3* 43 .2 38.7 ** 25 0 2, 000 µm 17 .2 31 .2* 20 .1 23 .8 106 25 0 ... 3,159 2, 448 2, 904 4,701 6,063 % Total 64.7 74.1 61 .2 71.4 62. 8 72. 8 Protozoa Respiration 1 32 208 56 104 188 3 12 % Total 3.8 4.9 1.4 2. 6 2. 5 3.7 Nematodes Respiratio...

Ngày tải lên: 11/08/2014, 15:20

... Press LLC remaining roots increased while dry weight decreased. A slight net immobi- lization of minerals of N and P during autumn appeared in CONV but not in INT. During the next growing season ... in interpreting the results of such studies, however, as the immediate root environment, including root -soil contact, has been mod- ified. A comparison with decay along minirhizotron tubes...

Ngày tải lên: 11/08/2014, 15:20

... vesicular-arbuscular mycorrhizal fungi in acid-infertile soils of a savanna ecosystem. Plant Soil, 122 :22 9 24 0. Douds, Jr., D. D., Janke, R. R., and Peters, S. E., 19 92. Effect of 10 years of low-input sustainable ... nutrients in inter- and intra-specific combinations of host plants. New Phytol., 1 02: 103–111. Francis, C. A., 1989. Biological efficiencies in multiple-cropping...

Ngày tải lên: 11/08/2014, 15:20

... 94.1 72. 3 14.5 Alley cropping perm. 91.6 4501 322 .4 25 0.0 39.8 Alley cropping new 59.4 3170 24 6.1 20 3.0 26 .2 Pueraria mulch perm. 86.3 4554 351.6 321 .2 27.3 Pueraria mulch new 55 .2 2764 21 2.4 171.4 ... 1 a 186.3 109 .2 67.0 70.9 Leucaena alley cropping 4 a 170.9 22 2 .2 115 .2 161.1 Pueraria live mulch 4 a 309.5 180.1 20 7.0 124 .1 Leucaena alley cropping 5 b 49.1 47.8...

Ngày tải lên: 11/08/2014, 15:20

... Sub-Saharan African Countries Country N P K 19 82 84 20 00 19 82 84 20 00 19 82 84 20 00 Benin –14 –16 –1 2 –9 –11 Botswana 0 2 1 0 0 2 Cameroon 20 21 2 2 – 12 –13 Ethiopia –41 –47 –6 –7 26 – 32 Ghana ... many of the great gains in production made in the green revo- lution by use of high-yielding varieties with high inputs of inorganic fertilizer cannot be maintained indefinitel...

Ngày tải lên: 11/08/2014, 15:20

... cm kg ha -1 to 30 cm % dS cm -1 Conventional (n=8) 82. 1 a 4 10.7 a 36.6 b 136 a 29 .6 a 20 .6 a 24 0 a 6.4 a Organic (n =28 ) 85.0 a 12. 1 a 83 .2 a 144 a 14.8 b 22 .6 a 22 3 a 6.4 a 1 POM—particulate ... Quality Soil Building and maintaining soil quality is the basis for successful organic farming. However, before developing a soil management plan focused on soil q...

Ngày tải lên: 20/04/2014, 17:43

... (formylaminoantipyridine and aminoantipyridine), and two micobio - l o gical metabolites (1,5-dimethyl-1 , 2- dehydro-3-pyrazolone, 4-( 2- methylethyl )-1 , 5- dimethyl-1 , 2- dehydro-3-pyrazole) were studied. ... dimethylami- nophenazone, phenazone, propyphenazone, 1-acetyl-1-methyl -2 - dimethyloxanoyl- 2- phenylhydrazide, 1-acetyl-1-methyl -2 - phenylhydrazide, two human met...

Ngày tải lên: 18/06/2014, 16:20

... below a sustainable level. Instead of extinction, a population may be sustainable or even increase due to its rescue from a neighboring population. If the structure of the ecological land- scape ... particular kind of interaction determines whether the effect is broad or more specific within the organism and phylogenetically. Figure 2. 2 Parameters and indications of the interact...

Ngày tải lên: 10/08/2014, 20:20