Knott's Handbook for Vegetable Growers

Maynard, Donald N.; Hochmuth, George

doi:10.1002/9780470121474

Cited by 213 publications

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“…The leaf tissue levels were in the adequate to high range for this stage of growth in tomato, and the plants showed no visual symptoms of P toxicity (Maynard and Hochmuth 1997). Zinc levels were also in the adequate to high range, also indicating that P availability was not excessive, since overly high P levels can induce Zn deficiency in plants (Marschner 1995).…”

Section: Discussionmentioning

confidence: 99%

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Growth, nutrition, and soil respiration of a mycorrhiza-defective tomato mutant and its mycorrhizal wild-type progenitor

Cavagnaro

Langley

Jackson

et al. 2008

Functional Plant Biol.

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Abstract. The effects of colonisation of roots by arbuscular mycorrhizal fungi (AMF) on soil respiration, plant growth, nutrition, and soil microbial communities were assessed using a mycorrhiza-defective tomato (Solanum lycopersicum L.) mutant and its mycorrhizal wild-type progenitor. Plants were grown in rhizocosms in an automated respiration monitoring system over the course of the experiment (79 days). Soil respiration was similar in the two tomato genotypes, and between P treatments with plants. Mycorrhizal colonisation increased P and Zn content and decreased root biomass, but did not affect aboveground plant biomass. Soil microbial biomass C and soil microbial communities based on phospholipid fatty acid (PLFA) analysis were similar across all treatments, suggesting that the two genotypes differed little in their effect on soil activity. Although approximately similar amounts of C may have been expended belowground in both genotypes, they may have differed in the relative C allocation to root construction v. respiration. Further, net soil respiration did not differ between the two tomato genotypes, but root dry weight was lower in mycorrhizal roots, and respiration of mycorrhizal roots per unit dry weight was higher than nonmycorrhizal roots. This indicates that the AM contribution to soil respiration may indeed be significant, and nutrient uptake per unit C expenditure belowground in this experiment appeared to be higher in mycorrhizal plants.

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Section: Discussionmentioning

confidence: 99%

“…The levels of extractable soil P in this study are considered below excessive levels for vegetables (Maynard and Hochmuth 1997). The leaf tissue levels were in the adequate to high range for this stage of growth in tomato, and the plants showed no visual symptoms of P toxicity (Maynard and Hochmuth 1997).…”

Section: Discussionmentioning

confidence: 99%

Growth, nutrition, and soil respiration of a mycorrhiza-defective tomato mutant and its mycorrhizal wild-type progenitor

Cavagnaro

Langley

Jackson

et al. 2008

Functional Plant Biol.

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“…It is also possible that some nitrate was leached from the soil by the higher rainfall in this season. Despite the cooler year, 960 mm of water was required to maximize yield, which is well above the general rule of 25 mm per week (Maynard and Hochmuth 1997) or approximately 425 mm over the season for late cabbage. However, it is possible that there are differing water requirements at different stages of cabbage growth.…”

Section: Discussionmentioning

confidence: 99%

Nitrogen and water requirements of fertigated cabbage in Ontario

McKeown¹,

Westerveld²,

Bakker³

2010

Can. J. Plant Sci.

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. 2010. Nitrogen and water requirements of fertigated cabbage in Ontario. Can. J. Plant Sci. 90: 101Á109. Increasing nutrient and water regulations have necessitated development of best management practices for application of nitrogen (N) and water. This study was conducted to determine if there was an optimal balance of N and water applied for late storage cabbage (Brassica oleracea L. var. capitata). Five rates of N and five irrigation rates arranged in a response surface design replicated three times were supplied to Huron cabbage grown on sandy loam soil to study the interaction of N and water applied. Plots were located at the University of Guelph, Simcoe Research Station, Ontario, Canada from 2003 to 2005. Total and marketable yields were maximized from a low of 278 kg ha(1 N in 2005 to above the highest rate tested (400 kg ha (1 N) in the other 2 yr. In 2005, there were 29 d above 308C and marketable yield was 49% lower than 2004, which had only 1 d above 308C. A target soil water value of 100% of field capacity was required to maximize yield in all 3 yr. More N is required as the water supply increases. The main influence of irrigation and N application was on head volume. Head density based on fresh weight was not influenced by irrigation or N application, but head density based on dry weight decreased with increased N application. Irrigation and N application should be managed concurrently to maximize yield and quality and N and irrigation efficiency for late storage cabbage. However, N and water will not prevent lost yield due to hot days, which suggests that late-cabbage yields are very sensitive to high air temperatures. , anne´e où la tempe´rature n'a de´passe´308C qu'une seule fois. Une teneur en eau e´gale a`100 % de la capacite´du terrain s'est ave´re´e ne´cessaire pour maximiser le rendement chaque anne´e. La quantite´de N requise augmente avec l'approvisionnement d'eau. L'irrigation et les applications de N influent principalement sur le volume des pommes de chou. La densite´des pommes selon le poids frais n'est pas affecte´e par l'irrigation ni les applications de N, mais en poids sec, elle diminue avec les applications de N. On devrait ge´rer simultane´ment l'irrigation et les applications de N pour maximiser le rendement du chou tardif de longue conservation et l'efficacite´des deux amendements. Cependant, les applications de N et l'eau n'empeˆcheront pas les pertes re´sultant de la chaleur, ce qui laisse croire que le rendement du chou est tre`s sensible aux tempe´ratures ambiantes e´leve´es.

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“…1). Root K content increased with both soil residual K and applied K. Maynard and Hochmuth (1997) report that fresh carrots generally contain 323 mg K 100 g -1 (27 mg K g -1 on DM basis). In soils with L-, L and M soil K, applications of 300, 150 and 75 kg K ha -1 , respectively, increased root K to the 27 mg K g -1 levels.…”

Section: Resultsmentioning

confidence: 99%

Potassium management for carrots in Prince Edward Island

Sanderson¹,

Sanderson²

2006

Can. J. Plant Sci.

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[1405][1406][1407]. Nine field studies were conducted over a 3-yr period to determine the response of carrot (Daucus carota L.) to soil-applied K on sandy to loamy sand Orthic Podzol soils in Prince Edward Island (PEI), Canada. Mid-season soil K levels ranged from 34 to 103 µg g -1 , and sites were classified as L-(very low), L (low) and M (medium) (Mehlich 3 extractable) according to the PEI Soil and Feed Testing Laboratory. Cultivars used were Imperator-type and the crops were managed to conform to local growing practices. Treatments consisted of preplant broadcast applied muriate of potash (KCl) at 0, 75, 150, 225 or 300 kg K ha -1 . When no K was applied, total carrot yields on the L-, L and M soil K ratings were 70, 90 and 98% of the maximum yield, respectively. To achieve 95% of the maximum yield, 150, 75 and 0 kg K ha -1 were required on the L-, L and M soils, respectively. Increasing rates of applied K linearly increased the K content of carrot petioles and soil samples taken at harvest. Potassium content in the carrot roots increased linearly with the rate of applied K, but parallel line analyses indicated that separate K response lines were required for each K soil test rating. Rates of 300, 150 and 75 kg K ha -1 were required to increase root K content to above the published standard of 27 mg g -1 (DM basis) on the L-, L, and M soil K sites, respectively. Une hausse linéaire de la quantité de K appliquée accroît la teneur en K des pétioles de carotte et du sol échantil-lonné à la récolte. La teneur en K des racines de carotte augmente linéairement avec la quantité de K appliquée, mais le titrage en séries parallèles indique qu'il faut recourir à des séries de réaction au K distinctes pour chaque essai visant à classer le sol en fonction de cet élément. Pour porter la teneur en K des racines au-delà de la norme de 27 mg par gramme (selon la matière sèche), on doit respectivement appliquer 300, 150 et 75 kg de K par hectare aux sols L-, L et M.

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Knott's Handbook for Vegetable Growers

Cited by 213 publications

References 0 publications

Growth, nutrition, and soil respiration of a mycorrhiza-defective tomato mutant and its mycorrhizal wild-type progenitor

Growth, nutrition, and soil respiration of a mycorrhiza-defective tomato mutant and its mycorrhizal wild-type progenitor

Nitrogen and water requirements of fertigated cabbage in Ontario

Potassium management for carrots in Prince Edward Island

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