摘要:

A significant proportion of agricultural productivity is consumed by the human population and the nutrients thus exported from the farm will be found in human excreta. Nutrients present in human excreta can therefore make a substantial contribution to the nutrient demand in agriculture.

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755122

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The effect of biological nitrogen fixation, as well as the addition of phosphorus, on three stages of soybean growth, were tested in field experiments in an area of Greece extremely poor inRhizobiaeffective on soybeans. The soil-agar technique permitted the isolation of an effective indigenousRhizobiumstrain from this area, which in turn was used as inoculum in the field experiments. One nodulating variety,Glycine max(L.) Merr, and one non-nodulating as control were used, while nitrogen fertilizer labelled with15N enabled the nitrogen derived from fixation (% NdfF), from fertilizer (% Ndff) and from the soil (% Ndfs) to be estimated.

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755123

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The effect of nitrogen, phosphorus and molasses enrichment on the decomposition of organic matter during composting of ligno-cellulosic waste was studied. The loss of organic matter increased with decrease in C:N ratio of the waste through the addition of inorganic nitrogen but the loss of this added nitrogen was very high when the C:N ratio narrowed down from 30 to 25. The maximum rate of decomposition with minimum loss of nitrogen was recorded with the enrichment by both nitrogen (C:N ratio of 30) and low grade phosphate rock (Waste: PR ratio of 4: l) at the level of 70% moisture on a dry weight basis. The incorporation of cattle dung into ligno-cellulosic waste suppressed the decomposition while molasses improved it and matured the compost within a short duration of 60 days. The culture of cellulolytic organisms did not compete well with the native micro flora during the composting of the waste. The inoculation with one litre slurry containing 5% each of dung, soil and well decomposed compost was enough to introduce the microflora which increased the decomposition and brought about early maturation of the compost.

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755124

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The discovery of ‘raised bed’ systems of agriculture in the Andean countries of South America, together with the continued interest inchinampas(raised-field systems) in Mexico, has stimulated interest in the sustainable potential of these systems of production. The paper reviews the evidence about ‘raised-field’ systems in the Americas, recounts the history of these systems and their eventual demise and provides a list of research contacts.

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755125

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Fluctuations of the root-lesion nematode,Pratylenchus indicus, populations in rice intercropped with greengram of redgram in kharif (wet season) and in rotation with two legume crops, viz. horsegram, blackgram or an oil seed crop, viz. mustard, during rabi (dry season) were recorded in a three-year field trial. Nematode populations from soil and root samples were compared at maximum growth, flowering and harvest of all the crops.

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755126

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755128

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755129

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755130

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755131

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0144-8765    

DOI:10.1080/01448765.1987.9755132

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor