Nitrogen Nutrition of Self-Rooted Olive in Sand Culture. Effect of Nh4-N/No3-N on Growth and Nutritional Status

Tattini, Massimiliano; Cimato, A.; Bertoni, P.; Lombardo, Monia Federica

doi:10.17660/actahortic.1990.286.65

Cited by 3 publications

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“…These results stress the close relationships between the effects of humic substances on plant development and iron nutrition, (Aguirre et al, 2009). Tattini et al, (1990) found that the humic acid supplies increased the root/top ratio as well as thin root production. The role of humic substances on nitrogen uptake appears to be fundamental.…”

Section: Introductionmentioning

confidence: 97%

APPLICATION ONE OF HYDROPONIC SYSTEMS IN PRODUCTION OF Catharanthus roseus L. PLANT

Koriesh

Khalil²,

El-Fatah

2009

Journal of Plant Production

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This study was conducted during the two successive seasons of 2005 and 2006 at the Experimental Farm of El-Kassasin Horticultural Research Station, Ismailia Governorate, using periwinkle plant (Catharanthus roseus, L. G. Don cultivar) to study the effect of nitrogen sources, humic acid concentrations and their interactions on growth and the content of alkaloids determined as perivine. Plants raised in sand culture and irrigated with complete nutrient solution contain five different ratios of nitrate-N to ammonium-N and four different concentrations of humic acid. Greatest growth measured by plant height (cm), stem diameter (cm), number of branches/plant, number of leaves/plant, root main length (cm), fresh and dry weights of branches (g)/plant, fresh and dry weights of leaves (g)/plant, fresh and dry weights of roots (g)/plant, N.P.K. % and content of alkaloids occurred at the highest ratios of nitrate-N to ammonium-N. Similar trend was obtained with 200 ppm humic acid.

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Section: Introductionmentioning

confidence: 97%

APPLICATION ONE OF HYDROPONIC SYSTEMS IN PRODUCTION OF Catharanthus roseus L. PLANT

Koriesh

Khalil²,

El-Fatah

2009

Journal of Plant Production

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Effect of nitrogen source on olives growing in soils with high boron content

Chatzissavvidis

Therios

Antonopoulou

2007

Aust. J. Exp. Agric.

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A greenhouse experiment was conducted to study the effects of nitrogen (N) forms (NO3–, 2.6 mmol/L; NH4+, 2.6 mmol/L; NO3–, 1.0 mmol/L plus NH4+, 1.6 mmol/L) and boron (B) (0.025, 0.5 and 1.0 mmol/L) on the growth and mineral composition of olive plants (Olea europaea L.). One-year-old own-rooted plants of the olive cultivars Megaritiki, Chondrolia Chalkidikis, Koroneiki and Kalamon were grown in plastic bags containing inert sand–perlite medium (1 : 1) and were irrigated with a 50% modified Hoagland nutrient solution. The plants treated with NO3– and 1.0 mmol B/L presented higher leaf B than those treated with NH4+ and 1.0 mmol B/L, for all cultivars. The addition of ammonium form fertilisation caused a significant accumulation of B to root tissues when the latter consisted of 0.5 mmol/L. As B was increased in the NO3–-N treatments, the number of leaves and the root dry weight of cv. Megaritiki as well as the plant height of cvv. Koroneiki and Kalamon were reduced. The above results suggest that in olive, addition of NH4+ to high B soils may be more beneficial for growth of olives than addition of NO3–. In most cases N form did not affect total leaf and root N levels. Also, the NH4+-N treatments showed a decline in root phosphorus (P) and an increase in leaf potassium with increased B. The general trend was a decrease of P in leaves with increasing B.

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