https://orcid.org/0000-0002-6961-126X
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ABSTRACT
Nitrogen (N) availability affects the boron (B) and chloride (Cl) concentrations in potato plants. The objective of our study was to evaluate: 1) the effect of nitrogen (N) fertilization on boron (B) and chloride (Cl) concentration in leaves and tubers, yield and tuber quality; and 2) the use of nitrogen nutrition index in shoot biomass (NNIsh) and in the tuber at harvest (NNItH) to estimate B and Cl nutrition status. Two trials were carried out (2009/10 and 2010/11). At each year, a split-plot randomized complete blotuber B uptakeck design with three replications was used. The main plot was the N rate applied at planting (0 or 50 kg N ha−1), and the subplots were the N rate applied at tuber initiation (0, 50 or 100 kg N ha−1). Our results showed that leaf B concentration and yield increased with N availability (13% and 5%, respectively). While leaf and tuber Cl concentration and DM decreased with N availability (16%, 18% and 3%, respectively). Moreover, the NNIsh was related to the leaf B and Cl concentration and relative yield. The NNItH was also closely related to dry matter (DM), B and Cl concentrations in tubers at harvest. This study demonstrated that N fertilization affected the concentration of B and Cl in leaf and tuber and that NNIsh and NNItH estimated the nutritional status of anionic micronutrients. Therefore, simultaneous N, B and Cl management is critical for increasing their use efficiencies and improving crop productivity.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Abbreviations
| B | = | boron |
| Cl | = | chloride |
| DAP | = | days after planting |
| DM | = | dry matter content |
| N | = | nitrogen |
| NNIsh | = | shoot nutrition nitrogen index |
| NNItH | = | tuber nutrition nitrogen index at harvest |
| NO3−-N | = | N-nitrate |
| P | = | phosphorus |
| ETP | = | potential evapotranspiration |
| RET | = | real evapotranspiration |
| ET0 | = | reference evapotranspiration |
| RY | = | relative tuber yield |
| SOM | = | soil organic matter |
| S | = | sulfur |
| Btup | = | tuber B uptake |
| TF | = | tuber bulking |
| Cltup | = | tuber Cl uptake |
| IT | = | tuber initiation |
Highlights
Objective: to evaluate nitrogen rate effects on boron and chloride concentration in leaves and tubers.
Nitrogen fertilization affected the uptake of boron and uptake chloride.
Boron concentration in leaves and tubers increased with nitrogen availability.
Chloride concentration in leaves and tubers decreased with nitrogen rate.