Diagnosis and measurement of multiple soil deficiencies by a subtractive technique

Middleton, K. R.; Toxopeus, M. R. J.

doi:10.1007/bf00011230

Cited by 78 publications

(34 citation statements)

References 4 publications

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“…Differences in the sulphur (S) content of the various treatments were adjusted by addition of gypsum as a surface application. Nitrogen (N), as ammonium nitrate; and potassium (K), as potassium chloride, were applied in 3 split dressings during each growth period of ryegrass, along with the micronutrient solution of Middleton & Toxopeus (1973). Only a single dressing of N was applied to white clover after germination and immediately after each cut.…”

Section: Soils and Phosphate Sourcesmentioning

confidence: 99%

A glasshouse comparison of 6 phosphate fertilisers

Mackay

Syers

Gregg

1984

New Zealand Journal of Experimental Agriculture

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In a glasshouse experiment the effectiveness of Chatham Rise phosphorite (CRP) as a source of phosphorus (P) for perennial ryegrass and white clover on 6 contrasting soils was compared with single superphosphate, North Carolina phosphate rock (NCPR), Sechura phosphate rock (SPR) from Peru, Tennessee phosphate rock (TPR), and calcined Christmas Island 'C' grade phosphate rock (Calciphos). The 6 P sources are ranked in the following order of effectiveness for ryegrass under glasshouse conditions: superphosphate ~ NCPR ~ SPR > CRP > > Calciphos > > TPR. A marked difference was found in the ability of the 2 plant species to use P from a phosphate rock (PR). SPR was as effective as superphosphate on clover. This was particularly pronounced when the comparison was based upon P uptake data rather than yield data. In fact there was no difference between superphosphate, SPR, and CRP when P uptake by clover was used as the measure of effectiveness. When P uptake by ryegrass was used to assess agronomic performance rather than ryegrass yield data, the reactive PR materials, NCPR, SPR, and CRP were far less effective than superphosphate. The results indicate that both dry matter yield and P uptake data are required to fully evaluate the agronomic effectiveness of PRo Extrapolation of the results of this glasshouse experiment to field situations is discussed.

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Section: Soils and Phosphate Sourcesmentioning

confidence: 99%

A glasshouse comparison of 6 phosphate fertilisers

Mackay

Syers

Gregg

1984

New Zealand Journal of Experimental Agriculture

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“…Inorganic N was also determined in samples (a) above by the methods of Bremner & Keeney (1965). All except 6 cores from each site were supplied with a P-free nutrient solution modified from Middleton & Toxopeus (1973). The remaining 6 cores were given a complete nutrient solution (including P) to provide an estimate of maximum yield.…”

Section: Methodsmentioning

confidence: 99%

A comparison to two phosphorus soil tests as inputs to a pasture growth model

Smith

Gregg

1982

New Zealand Journal of Agricultural Research

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Soil samples, collected from field plots previously treated with different rates of P, were used to investigate relationships between plant growth and extractable soil P in 2 separate glasshouse studies. In the first study, pasture production on intact soil cores was measured whereas the second study involved the growth of ryegrass in pots of sieved soil. Levels of both water-extractable P and Olsen (bicarbonateextractable) P in the soil samples were determined. The relationships between relative yield and waterextractable P differed markedly between 2 soils in both glasshouse studies but that between relative yield and Olsen P was much less dependent on soil type. The Olsen procedure was therefore considered a more suitable index of plant-available soil P from which to predict pasture production on soils differing in P retention. Although yield variability reduced the precision of data from the intact cores, it was considered that these data were more readily applied to the fi~ld situation than are the results obtained using conventIOnal glasshouse pot techniques. Suggestions are made for improving the precision of intact core data.

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“…All pots received complete nutrient solution lacking nitrogen and phosphate (Middleton & Toxopeus 1973) each week to ensure that phosphate only was limiting growth to nodulated plants. Shoot growth ofthe host plants was harvested on several occasions and the entire host plants were removed from the inoculum soils at 175-206 days after seedling transplant in Dunmore soil and at 168days in Waingaro soil, Root infection levels of the host plants were assessed in 3 out of 5 replicate pots at each phosphate fertiliser level in each inoculum soil.…”

Section: Rost Plant Growthmentioning

confidence: 99%

Effect of phosphate fertilisers on the production of mycorrhizal inoculum in soil

Powell

1980

New Zealand Journal of Agricultural Research

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Mycorrhizal inocula were prepared in two soils by growing white clover host plants with a variety of phosphate fertilisers applied at rates ranging from 0 to 2.8 g/pot. The infectivity of the inocula was subsequently assessed using white clover as the test plant. Superphosphate generally depressed inoculum infectivity despite greatly increased host root growth. Chatham Rise and Christmas Island 'C' grade rock phosphates had little overall effect on inoculum infectivity despite greatly increased root growth in soil fertilised with Chatham Rise rock phosphate.

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Diagnosis and measurement of multiple soil deficiencies by a subtractive technique

Cited by 78 publications

References 4 publications

A glasshouse comparison of 6 phosphate fertilisers

A glasshouse comparison of 6 phosphate fertilisers

A comparison to two phosphorus soil tests as inputs to a pasture growth model

Effect of phosphate fertilisers on the production of mycorrhizal inoculum in soil

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