Abstract
Agronomic practices in Indonesia mostly still use ammonium as the primary source of nitrogen (N), whereas ammonium concentrations at certain levels can cause plant toxicity. The selection of the suitable N form (NH4+ and NO3-), especially by the fertigation method, is expected to increase the efficiency of N fertilization. This research aimed to obtain the appropriate source of NH4+ and NO3- to increase production and efficiency of fertilization in shallots. The experiment used a non-factorial randomized complete block design with four replications and six nitrogen treatments: without N, ammonium sources (urea, ZA), nitrate source (calcium nitrate), and combination of ammonium and nitrate (NPK Mutiara 16-16-16, calcium ammonium nitrate). The fertilizer doses contain N in equivalent levels, i.e., 167.9 kg N ha-1. The results showed that ZA increased the chlorophyll content of leaves and N content of plant tissue, while calcium nitrate increased the size and weight (fresh and dry) of bulb per plant. The highest recovery and agronomy efficiency was obtained in the ZA application, while the highest physiological efficiency and partial factor productivity were in calcium nitrate. Therefore, nitrate has the potential for shallot cultivation because it can increase production without accumulation in the bulbs. Keywords: Allium cepa; drip irrigation; nitrogen fertilizer; nitrogen form; NUE
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Claims 5
Claim · model-written summary
ZA increased chlorophyll content of shallot leaves and N content of plant tissue.
- Taxon
- shallot
Allium cepa var. aggregatumt0 - Treatment
- ZAe1
- Outcome
- chlorophyll content of leaves and N content of plant tissuee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“shallot production”
e1“ZA increased the chlorophyll content of leaves and N content of plant tissue”
Claim · model-written summary
Calcium nitrate increased the size and fresh and dry weight of shallot bulbs per plant.
- Taxon
- shallotAllium cepa var. aggregatumt0
- Organ / stage
- bulbe2
- Treatment
- calcium nitratee2
- Outcome
- size and weight (fresh and dry) of bulb per plante2
- Direction
- increasede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“shallot production”
e2“calcium nitrate increased the size and weight (fresh and dry) of bulb per plant”
Claim · model-written summary
ZA application gave the highest recovery and agronomic efficiency of applied N in shallot.
- Taxon
- shallotAllium cepa var. aggregatumt0
- Treatment
- ZA applicatione3
- Outcome
- recovery and agronomy efficiencye3
- Direction
- higheste3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“shallot production”
e3“The highest recovery and agronomy efficiency was obtained in the ZA application”
Claim · model-written summary
Calcium nitrate gave the highest physiological efficiency and partial factor productivity in shallot.
- Taxon
- shallotAllium cepa var. aggregatumt0
- Treatment
- calcium nitratee4
- Outcome
- physiological efficiency and partial factor productivitye4
- Direction
- higheste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“shallot production”
e4“while the highest physiological efficiency and partial factor productivity were in calcium nitrate”
Claim · model-written summary
Nitrate can increase shallot production without accumulating in the bulbs.
- Taxon
- shallotAllium cepa var. aggregatumt0
- Treatment
- nitratee5
- Outcome
- productione5
- Direction
- increasee5
- Qualifier
- without accumulation in the bulbse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“shallot production”
e5“nitrate has the potential for shallot cultivation because it can increase production without accumulation in the bulbs”
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