SOIL ECOLOGY IN SUSTAINABLE AGRICULTURAL SYSTEMS - CHAPTER 1 ppsx

... Biota in Sustainable Farming Systems, Adelaide, Australia, March 15 18 , 19 94, 19 7–203. Brussaard, L. and Kooistra, M. J., Eds., 19 93. Editors’ introduction, in Soil Struc- ture /Soil Biota Interrelationships,” ... L., 19 94. The ecology of soil organisms in reduced input farming, in Soil Biota Management in Sustainable Farming Systems, Pankhurst, C. A., Ed.,...

Ngày tải lên: 11/08/2014, 15:20

... 0.2 1. 2 1. 2–6 6–30 30–90 >90 Total Sand 1 6.0 2 .1 8.3 18 .8 5.4 4.9 42.2 2 10 .5 5 .1 10 .1 17.0 3.7 2.9 49.3 Loam 1 18.4 8.3 13 .4 0.0 3.0 5 .1 48 .1 2 20 .1 11. 4 16 .1 0.0 2.6 8.3 58.7 Clay 1 29.2 10 .9 ... 9.5 Arable Sand 1. 6 1. 6 0.6 1. 1 12 .4 9.2 0.7 Clay 1. 8 1. 4 2.0 1. 8 2 .1 1.6 1. 8 Table 3 Amount of Microbial Biomass-C in the Different Grassla...

Ngày tải lên: 11/08/2014, 15:20

... Soil Sci. Soc. Am. J., 47 :11 25 11 29. Robertson, G. P., 19 94. The impact of soil and crop management practices on soil spatial heterogeneity, in Soil Biota: Management in Sustainable Farming Systems, Pankhurst, ... 2,253 3 ,15 9 2,448 2,904 4,7 01 6,063 % Total 64.7 74 .1 61. 2 71. 4 62.8 72.8 Protozoa Respiration 13 2 208 56 10 4 18 8 312 % Total 3.8 4.9 1. 4 2.6 2...

Ngày tải lên: 11/08/2014, 15:20

... Jeffree, C. E., 19 93. Plant and bacterial mucilages of the maize rhizosphere: comparison of their soil binding properties and histochem- istry in a model system. Plant Soil, 15 1 :15 1 16 5. © 19 97 by CRC ... Theory. Plant Soil, 16 4 :10 7 11 8. Volkmar, K. M., 19 93. A comparison of minirhizotron techniques for estimating root length density in soils of different bulk density....

Ngày tải lên: 11/08/2014, 15:20

... nutrients in inter- and intra-specific combinations of host plants. New Phytol., 10 2 :10 3 11 1. Francis, C. A., 19 89. Biological efficiencies in multiple-cropping systems. Adv. Agron., 42 :1 24. Galvis-Spinola, ... 91: 117 11 9. Sieverding, E., 19 90. Ecology of AM fungi in tropical agroecosystems. Agric. Ecosys- tems Environ., 29:369–390. Sieverding, E., 19 91. Vesicular arbu...

Ngày tải lên: 11/08/2014, 15:20

... alley cropping 1 a 19 7 .1 248.4 14 2.8 18 2 .1 Pueraria live mulch 1 a 18 6.3 10 9.2 67.0 70.9 Leucaena alley cropping 4 a 17 0.9 222.2 11 5.2 16 1 .1 Pueraria live mulch 4 a 309.5 18 0 .1 207.0 12 4 .1 Leucaena ... role in low-input agricultural systems. Their casting activity involves up to 11 .6% of the organic carbon and 12 .9% of the total nitrogen of the 0 to...

Ngày tải lên: 11/08/2014, 15:20

... Booth, R., 19 82. Farmer-back-to-farmer: a model for generating acceptable agricultural technology. Agric. Admin., 11 :12 7 13 7. Richards, P., 19 85. Indigenous Agricultural Revolution: Ecology and ... ha 1 yr 1 ) of Arable Land for Some Sub-Saharan African Countries Country N P K 19 82–84 2000 19 82–84 2000 19 82–84 2000 Benin 14 16 1 –2 –9 11 Botswana 0 –2 1 0 0 –2 Cam...

Ngày tải lên: 11/08/2014, 15:20

... Agriculture (PM 18 80). (See page 8 for ordering instructions.) Building and maintaining soil quality is the basis for successful organic farming. Periodic soil testing will help determine soil quality. USDA ... was being incorporated into biologically active soil organic matter. The 15 percent increase in water stable aggregation (Table 1) also suggests the slight increase...

Ngày tải lên: 20/04/2014, 17:43

... 2207 1- 1 5-4 0.008 12 5 lincomycin 15 4-2 1- 2 nd-0 .1 12 n,n-diethyl-m- toluamide (DEET) 13 4-6 2-3 nd -1 3 12 0.066 max 54 naphthalene 9 1- 2 0-3 nd-0.09 12 noroxaxin 7045 8-9 6-7 5.8 max 0. 1- 0 . 31 100 13 4 nonylphenol monoethoxylate 3.9 6-7 9.4 e 19 ... only nd-0.004 nd-0.056 0. 01 max 13 3 14 6 11 6 13 1 10 2 sulfamerazine 12 7-7 9-7 nd-0...

Ngày tải lên: 18/06/2014, 16:20

... Foreword 11 3 6.2 Introduction 11 3 6.3 Persistence of Metals in Soil 11 4 6.3 .1 Residence Time of Metals in Soil 11 4 6.3.2 Critical Loads of Metals 11 4 6.3.3 Aging of Metals in Soil 11 5 6.3.4 Transformation ... North 12 th Avenue, Pensacola, Florida 325 01 Telephone: (850) 46 9 -1 500 ; Fax: (850) 46 9-9 778; Email: setac@setac.org Web site: www.setac.org ISBN -1...

Ngày tải lên: 12/08/2014, 04:22