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By Bhamidimarri, Rao

Court cases of the overseas convention held at Massey college, Palmerston North, New Zealand, 26-27 may perhaps 1988

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This was independent of application rate and reflects the low cation exchange capacity of the sandy loam soils. There has been no reduction in soil permeability to date. This may due to the high rainfall and reduced irrigation over the winter period, allowing leaching of the sodium and a reestablishment of the cation balance. A start has been made to determine the changes in soil properties induced by long-term effluent application. Soil samples were taken, to depths of 0 to 50 mm and 50 to 100 mm, on a random basis from each of the irrgated areas and control areas and analysed for a wide range of soil physical and chemical properties after fifteen months of irrigation.

Each sprinkler covers a 60 m diameter circle and effluent is applied at three rates—35, 105, 210 mm per week. The controls are comparable areas that receive no effluent. There are two replicas of each treatment. The site selected for the trial is located on Onepu loamy coarse sand, which is representative of soil types of the area. Effluent is applied throughout the year except during some very wet winter periods. The quantity of effluent and rain received on site is shown in Table 1. TABLE 1 Quantity of effluent and rainfall received by irrigated and control areas since irrigation commenced Rate of Effluent Application mm/week Rainfall and Effluent Received by Pasture mm 0 35 105 210 3,224 6,789 11,439 19,654 By applying irrigation on the test plots during the whole year, we have applied more intensive irrigation than will take place in the future full-scale installation.

Studies have shown that a substantial reduction in organic matter and a partial reduction in sodium and colour content is achieved, together with an increase in pasture production. Problems can arise in soil permeability, due to the high sodium levels in the wastewater, and in groundwater quality, due to excessive leaching. However, soils around Kawerau are derived from recent volcanic ashes, and underlying most soils of the Tarawera Plains are thick deposits of pumice, sands and gravels [5]. The predominant characteristic of the soil is its coarseness and free draining property.

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