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Nitrogen forms affect root growth, photosynthesis, and yield of tomato under alternate partial root-zone irrigation

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To increase efficiency of water and nitrogen (N) fertilizer use, this study was conducted with a
split-root pot experiment to investigate the effects of different forms of N fertilizer on root growth,
photosynthesis, instantaneous water use efficiency (IWUE), and yield of tomato (Lycopersicon
esculentum L.) under alternate partial root-zone irrigation (APRI). Three irrigation modes comprised
conventional irrigation (CI) and two kinds of APRI, i.e., APRI with water content in the drying
soil compartment controlled at ‡ 60% or 40% of the water-holding capacity (APRI-60, APRI-40).
Two N forms included ammonium-N and nitrate-N supplied as calcium nitrate or ammonium sulfate,
respectively. The results show that APRI-60 enhanced root growth and increased leaf IWUE
with a slight yield reduction compared with CI regardless of the N form supplied. In contrast, APRI-
40 significantly decreased root growth and inhibited photosynthesis, thereby resulting in a significant
yield loss. In addition, at the flowering stage tomato plants grew better with ammonium-N
than nitrate-N supply; however, at the fruit expansion stage and maturity stage, the tomato plants
had a higher biomass accumulation and yield with nitrate-N than ammonium-N supply. Therefore,
the application of APRI should consider the soil water condition coupled with an appropriate N
form. In the present study, APRI controlled at ≥ 60% of the water-holding capacity (WHC) for the
drying soil side with nitrate-N supply was the best water-fertilizer supply for tomato cultivation.

Key words: alternate partial root-zone irrigation / Lycopersicon esculentum L. / nitrogen form / root growth /
instantaneous water use efficiency / yield

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Informasi Detail

Judul Seri

J. Plant Nutr. Soil Sci.

No. Panggil

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Penerbit

New York : WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim., 2016

Deskripsi Fisik

J. Plant Nutr. Soil Sci. 2016, 179, 104–112

Bahasa

English

ISBN/ISSN

10.1002/jpln.2015001

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2016, 179

Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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