Soil testing of horticultural substrates for cyclamen and poinsettia

Prasad, M.; Widmer, Richard E.; Marshall, R.

doi:10.1080/00103628309367389

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…To our knowledge no documented research papers present information as specific as that presented herein on media test DV ranges for geranium. The media DV for N and P for geranium are higher than those reported for cyclamen (10), but similar to those for poinsettia and chrysanthemum (7,9,11). The media DV for K also are similar to those for poinsettia and chrysanthemum (10,11).…”

Section: Substratesupporting

confidence: 69%

“…The media DV for N and P for geranium are higher than those reported for cyclamen (10), but similar to those for poinsettia and chrysanthemum (7,9,11). The media DV for K also are similar to those for poinsettia and chrysanthemum (10,11).…”

Section: Substratesupporting

confidence: 69%

“…As the cropping progresses, a decline in growth media test values of unbuffered nutrient N is likely to occur as a result of plant uptake and retention by microorganisms in the medium (e.g., bark). The decline in P and K values during cropping might be less as buffering increases, particularly in bark (11). Hence, lower N values than those cited may suffice if fertilizer is applied regularly.…”

Section: Substratementioning

confidence: 97%

“…Simulated blends exhibiting suitable properties then would be selected for further evaluation. Development of the necessary predictive equations could lead to computer modeling of container media (11).…”

Section: Substratementioning

confidence: 99%

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Peat and Bark Media Nutrient Levels in Relation to Geranium Growth and Tissue Analysis

Widmer¹,

Prasad²,

Marshall³

1986

J. Amer. Soc. Hort. Sci.

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The relationship between water extraction (1:1.5) values and nutrient uptake in geranium (Pelargonium × hortorum Bailey) growing in moss peat (peat), bark, or moss peat and soil media was investigated. Nitrogen, P, and K fertilizers were incorporated in increments in the starting media and applied again in solution, about at the crop midpoint. Desirable nutrient N(NH4+-N + NO3--N), P(H2PO4--P) and K(K+) values (DV) from media analysis at the start of the experiments (MDV) and midway to flowering (FDV) also were calculated from regression equations on the basis of maximum growth rates, maximum dry weight production at midharvest, and final harvest. The relationships between plant uptake of N, P, and K and the water extract concentrations were generally very good, except for K in bark for both harvests and in peat at the first harvest, and an underestimated P uptake in peat + soil and in bark. The media DV obtained using growth data were broadly similar to those using plant dry weight data, although somewhat lower for N during the early growing period.

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Section: Substratesupporting

confidence: 69%

Section: Substratesupporting

confidence: 69%

Section: Substratementioning

confidence: 97%

Section: Substratementioning

confidence: 99%

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Peat and Bark Media Nutrient Levels in Relation to Geranium Growth and Tissue Analysis

Widmer¹,

Prasad²,

Marshall³

1986

J. Amer. Soc. Hort. Sci.

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“…Generalised conclusions from the results are presented in Table 8. Lower rates will of course be needed for media of higher NDI values and for plants that grow at a lower rate than that of the cabbage used here (6)(7)(8). these amounts plus that needed by the plants being grown.…”

Section: Effect Of Slow-release Fertilizers On Ndi and Cahhage Growthmentioning

confidence: 98%

Rapid assessment of the rate of nitrogen immobilisation in organic components of potting media: II. Nitrogen drawdown index and plant growth

Handreck

1992

Communications in Soil Science and Plant Analysis

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In several experiments, cabbage seedlings were grown in soilless potting media produced using a range of aged and composted pinebarks, peat and sawdusts. Their growth was compared with the Nitrogen Drawdown Indexes (NDI) of the media, measured by a standard method previously reported. Growth was highly correlated with NDI when N was applied via pre-plant additions and/or liquid drenches.Aged pinebarks and composted hardwood sawdusts, with high N immobilisation potential, have NDI values near zero and consume N at about 300 mg/L each week. Adequate plant growth is difficult to obtain in these media. Media with NDI values of around 0.5 consume about 40 mg/L N each week. Pre-plant amendment with N equivalent to that in 0.5-1.0 g/L NH 4 NO 3 is desirable and weekly feeding with a solution containing 200-400 mg/L N will give maximum growth rate. Weekly feeding with solutions containing 100-150 mg/L N provides sufficient N for excellent plant growth in peat-based media, whose NDI values are 0.95-1.0.

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Soil Testing and Plant Analysis: Guides to the Fertilization of Horticultural Crops

Jones

1985

Horticultural Reviews

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Soil testing of horticultural substrates for cyclamen and poinsettia

Cited by 11 publications

References 10 publications

Peat and Bark Media Nutrient Levels in Relation to Geranium Growth and Tissue Analysis

Peat and Bark Media Nutrient Levels in Relation to Geranium Growth and Tissue Analysis

Rapid assessment of the rate of nitrogen immobilisation in organic components of potting media: II. Nitrogen drawdown index and plant growth

Soil Testing and Plant Analysis: Guides to the Fertilization of Horticultural Crops

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