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Article
Correction to: Nitrous oxide emission factors in conventionally and naturally simulated cattle urine patches
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Article
Nitrous oxide emission factors in conventionally and naturally simulated cattle urine patches
We quantified nitrous oxide emission factors (N2O EFs) for cattle urine patches established using two simulation methods: (1) a uniformly wetted area (UWA) and (2) a naturally expanding effective area (NEEA). Fie...
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Article
Modelling nitrous oxide emissions from dairy-grazed pastures
Soil N2O emissions were measured during four seasons from two highly productive grass-clover dairy pastures to assess the influences of soil moisture, temperature, availability of N (NH 4 ...
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Article
Estimating seasonal and annual carbon inputs, and root decomposition rates in a temperate pasture following field 14C pulse-labelling
Using a 14C pulse-labelling technique, we studied the seasonal changes in assimilation and partitioning of photoassimilated C in the plant–root–soil components of a temperate pasture. Pasture and soil samples wer...
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Article
Soil organic matter transformations induced by Hieracium pilosella L. in tussock grassland of New Zealand
To study the effect of Hieracium pilosella L. invasion on the transformations of soil organic matter of New Zealand tussock grassland soils (Ustochrepts), plant material and soils underneath Hieracium, the surro...
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Article
Influence of soil phosphorus status and nitrogen addition on carbon mineralization from 14C-labelled glucose in pasture soils
This study examines the effect of soil P status and N addition on the decomposition of 14C-labelled glucose to assess the consequences of reduced fertilizer inputs on the functioning of pastoral systems. A contr...
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Article
Changes in soil microbial biomass, metabolic quotient, and organic matter turnover under Hieracium (H. pilosella L.)
In New Zealand Hieracium is an opportunistic plant that invades high country sites more or less depleted of indigenous vegetation. To understand the invasive nature of this weed we assessed the changes in soil C...
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Article
Development and evaluation of an improved soil test for phosphorus, 3: field comparison of Olsen, Colwell and Resin soil P tests for New Zealand pasture soils
Soil tests suitable for estimating the phosphorus (P) status of soils fertilised with soluble or sparingly soluble P fertilisers (reactive phosphate rock) were evaluated using the New Zealand Ministry of Agric...
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Article
Carbon and phosphorus transformations during decomposition of pine forest floor with different phosphorus status
Information on the mineralization of inorganic phosphate (Pi) from organically bound P (Po) during decomposition of forest floor and soil organic matter is vital for understanding P supply in forest ecosystems. ...
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Article
Partitioning and translocation of photosynthetically fixed 14C in grazed hill pastures
Information on carbon (C) flows and transformations in the rhizosphere is vital for understanding soil organic matter dynamics and modelling its turnover. We followed the translocation of photosynthetically f...
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Article
Elevated CO2 effects on carbon and nitrogen cycling in grass/clover turves of a Psammaquent soil
Effects of elevated CO2 (525 and 700 μL L−1), and a control (350 μL L−1 CO2), on biochemical properties of a Mollic Psammaquent soil in a well-established pasture of C3 and C4 grasses and clover were investigated...
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Chapter
Evaluation of soil tests for predicting pasture response on acid soils to phosphate supplied in water soluble and sparingly soluble forms
A range of soil tests, (moderately alkaline extractions of Olsen and Colwell, acid extractions of Truog and Bray and an anion exchange resin, with and without a cation exchange resin) were assessed for their a...
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Chapter
Liming effect of reactive phosphate rocks: A laboratory evaluation
A laboratory incubation study evaluated the liming properties of North Carolina (NC) and Arad phosphate rocks (PRs). Application of these two reactive phosphate rocks (RPRs) to topsoil samples of a Typic Albaq...
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Article
Assessment of the relative agronomic effectiveness of phosphate rocks under glasshouse conditions
Six phosphate rocks (PRs) of varying reactivities were compared with monocalcium phosphate (MCP) in a glasshouse experiment growing perennial ryegrass (Lolium perenne cv. Nui) as the test plant on four soils of c...
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Article
Response of dryland wheat to fertilizer nitrogen in relation to stored water, rainfall and residual farm yard manure
Yield response of dryland wheat to fertilizer N application in relation to components of seasonal water (available soil moisture and rainfall) and residual farm yard manure (FYM) was studied for five years (19...
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Article
Evaluation of soil phosphate status where phosphate rock based fertilizers have been used
Soil phosphorus (P) tests have usually been calibrated using regression relationships between test values and crop yields for soils with a history of soluble P fertilizer use. However, the regression relations...
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Article
Development and evaluation of an improved soil test for phosphorus. 2. Comparison of the Olsen and mixed cation-anion exchange resin tests for predicting the yield of ryegrass grown in pots
A glasshouse experiment was conducted on four soils contrasting in P sorption capacity and exchangeable Ca content with perennial ryegrass using six phosphate rock (PR) sources and a soluble P source applied a...
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Article
Development and evaluation of an improved soil test for phosphorus: 1. The influence of phosphorus fertilizer solubility and soil properties on the extractability of soil P
The objective of this work was to develop and evaluate a soil test suitable for estimating the phosphorus status of soils whether they were fertilized with soluble or sparingly soluble P fertilizers or both. F...
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Article
Dryland wheat yield dependence on rainfall, applied N and mulching in preceding maize
To evaluate the response of dryland wheat (Triticum aestivum L.) to mulching in preceding maize and fertilizer N application field experiments were conducted for six years (1980–86) with maize-wheat sequence on a...
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Article
A simplified resin membrane technique for extracting phosphorus from soils
A simplified procedure for determining the amount of phosphate (P) extracted from soils by ion exchange resin membranes is reported. Strips of anion (HCO 3 - f...
