Whole-plant Response of Six Poinsettia Cultivars to Three Fertilizer and Two Irrigation Regimes

Schuch, Ursula K.; Redak, Richard A.; Bethke, James A.

doi:10.21273/jashs.121.1.69

Cited by 11 publications

(11 citation statements)

References 21 publications

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“…All sensor readings followed positive quadratic and linear trends as fertilizer rates increased, which corresponds with similar findings in other ornamental crops like dianthus, vinca (Catharanthus roseus (L.) G. Don), zinnia, geranium, and poinsettia (Schuch et al 1996;Altland et al 2002;Khan et al 2004;Smith et al 2004;Wang et al 2012aWang et al , 2012bBasyouni et al 2015). The linear response in all sensor readings across treatments over time can be attributed to the increased nutrient release from the CRF granules with increased temperatures (temperature data not shown), and irrigation frequency (Tables 1-3).…”

Section: Discussionsupporting

confidence: 84%

Use of Nondestructive Sensors to Assess Nitrogen Status in Potted Dianthus (Dianthus chinensis L.) Production

2016

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Optical sensors are a fast and nondestructive new technology used to estimate plant chlorophyll content by measuring leaf reflectance or absorbance of light. The objective of this study was to evaluate the reliability of normalized difference vegetative index (NDVI) values calculated by the GreenSeeker™ hand held sensor as an indirect indicator of dianthus (Dianthus chinensis L.) N status, and investigate nutrient supplementation on deficient 'Telstar™ White' and 'Telstar™ Red Picotee' plants. Pots were supplemented with 0, 5, 10, 15, and 20 g of 15N-3.9P-10K controlled release fertilizer (CRF). Soil and plant analysis development (SPAD) chlorophyll meter, GreenSeeker™ NDVI sensor, and atLEAF meter readings were recorded for four consecutive weeks. At 49 d after planting (DAP), the 0 and 5 g treatments were found deficient and half of the pots were supplemented with extra fertilizer for treatment correction (C 0 and C 5, respectively). The SPAD and atLEAF readings showed stronger correlation to actual leaf N concentration compared with the GreenSeeker™. The GreenSeeker™ readings were less correlated with leaf N concentration at early stages of establishment due to the plants' small size and background noise, as well as at later stages of establishment due to anthesis. Dianthus quality responses generally increased as fertilizer rates increased. The additional correction treatment showed a significant improvement in C 5 and no significant improvement on C 0, indicating that the correction treatment was beneficial for dianthus when initial amount of fertilizer was applied.

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Section: Discussionsupporting

confidence: 84%

Use of Nondestructive Sensors to Assess Nitrogen Status in Potted Dianthus (Dianthus chinensis L.) Production

2016

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“…In maple, the low FC/low-MT trees received 59% less fertilizer than the high FC/high-MT treatments, but dry weight was 120% greater. These results paralleled those of Shuch et al (1995), who observed that moisture deficit had a much greater effect on biomass in poinsettias than did fertilizer concentration.…”

Section: Methodssupporting

confidence: 87%

“…Regression of foliar nutrient concentrations on N applied revealed a relatively strong association (Table 2). Shuch et al (1995) observed that moisture deficit did not affect foliar N concentrations. Results from the current experiment were similar in that MT had no effect, or a relatively small effect, on foliar nutrient concentrations, compared with FC.…”

Section: Methodsmentioning

confidence: 90%

“…A decrease in either major component of the water potential of the medium, osmotic or matric potential, can restrict water absorption (Marshall and Holmes, 1979). Other researchers (Dole et al, 1994;Shuch et al, 1995;Biernbaum, 1993, 1994) have found low or even negative correlations between plant growth and moderate rates of fertilization, and this may be related to fertilization effects on the water potential of the medium. Yelanich and Biernbaum (1990) observed no growth response in poinsettia to a 10-fold increase in fertilizer concentration.…”

Section: Methodsmentioning

confidence: 94%

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Fertilizer Concentration and Moisture Tension Affect Growth and Foliar N, P, and K Contents of Two Woody Ornamentals

Rose¹,

Rose²,

Wang³

1999

HortSci

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Crabapple [Malus ×zumi (Rehd.) `Calocarpa'] and maple (Acer ×freemanii E. Murray `Jeffersred') trees were grown in containers from 22 June to 3 Oct. with three fertilizer concentrations (50, 100, and 200 mg·L-1 N) and two levels of moisture tension in the medium [low setpoint (moist) = 5 kPa and high setpoint (dry) = 18 kPa]. Whole-plant growth was enhanced more by minimizing water stress than by increasing fertilizer concentration. Shoot length and whole-plant dry weight were greater (>29% for crabapple and >90% for maple) in low tension treatments (low water stress) but were unaffected by fertilizer concentration. Moisture tension also had a dominant effect on dry-weight allocation to leaves, stems, and roots. In contrast, foliar nutrient concentrations increased with fertilizer concentration but were affected to a lesser degree by moisture tension. Seasonal patterns in biomass allocation were little affected by treatments; the largest proportions of leaf and root biomass accumulated during summer and fall, respectively.

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“…If low volumes of water are applied to eliminate leaching without regard to maintaining adequate water in the container, then reduction in growth will occur. Schuch et al (1995) applied set volumes of water [240 mL·d -1 (8.1 fl oz/d) or 120 mL·d -1 (4.1 fl oz/day)] to six cultivars of poinsettias growing in a peat-based substrate. The low irrigation volume reduced all growth parameters in all cultivars by 36% to 41%.…”

Section: Irrigation Schedulingmentioning

confidence: 99%

More Plant per Gallon: Getting More Out of Your Water

Warren¹,

Bilderback²

2005

horttech

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Irrigation of container-grown ornamental crops can be very inefficient, using large quantities of water. Much research was conducted in the 1990s to increase water efficiency. This article examined water management, focusing on three areas: water application efficiency (WAE), irrigation scheduling, and substrate amendment. Increases in WAE can be made by focusing on time-averaged application rate and pre-irrigation substrate moisture deficit. Irrigation scheduling is defined as the process of determining how much to apply (irrigation volume) and timing (when to apply). Irrigation volume should be based on the amount of water lost since the last irrigation. Irrigation volume is often expressed in terms of leaching fraction (LF = water leached ÷ water applied). A zero leaching fraction may be possible when using recommended rates of controlled-release fertilizers. With container-grown plant material, irrigation timing refers to what time of day the water is applied, because most container-grown plants require daily irrigation once the root system exploits the substrate volume. Irrigating during the afternoon, in contrast to a predawn application, may increase growth by reducing heat load and minimizing water stress in the later part of the day. Data suggest that both irrigation volume and time of application should be considered when developing a water management plan for container-grown plants. Amending soilless substrates to increase water buffering and reduce irrigation volume has often been discussed. Recent evidence suggests that amending pine bark substrates with clay may reduce irrigation volume required for plant production. Continued research focus on production efficiency needs to be maintained in the 21st century.

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Whole-plant Response of Six Poinsettia Cultivars to Three Fertilizer and Two Irrigation Regimes

Cited by 11 publications

References 21 publications

Use of Nondestructive Sensors to Assess Nitrogen Status in Potted Dianthus (Dianthus chinensis L.) Production

Use of Nondestructive Sensors to Assess Nitrogen Status in Potted Dianthus (Dianthus chinensis L.) Production

Fertilizer Concentration and Moisture Tension Affect Growth and Foliar N, P, and K Contents of Two Woody Ornamentals

More Plant per Gallon: Getting More Out of Your Water

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