@misc{10481/77758,
year = {2022},
month = {10},
url = {https://hdl.handle.net/10481/77758},
abstract = {Phosphorus (P) is a limiting nutrient in many agroecosystems and, apart from affecting plant growth, can also limit biological
N2
fixation (BNF) by leguminous plants. Thus, increasing P supply can have a positive effect on BNF particularly in
P-deficient soils. Here, we provide new insights into the response of hairy vetch (Vicia villosa), widely adopted as a legume
cover crop, to P limitations, by comparing the effects of inorganic (Pi) and organic (Po) P supply on plant growth and BNF
capacity. This was achieved by means of a greenhouse experiment in which rhizobia-inoculated hairy vetch was grown in
a P-limited agricultural soil and changes in plant growth, nitrogen (N) and P uptake, BNF capacity, and soil phosphatases
activities were evaluated as a function of Pi and Po inputs, in the form of orthophosphate or phytic acid, respectively. When
compared to P-deficient conditions where BNF was primarily limited by plant growth rather than directly due to the high
P costs of symbiotic N fixation, Pi addition substantially enhanced plant growth (threefold), nodule formation (16-fold),
P acquisition (sixfold), and BNF efficiency (sevenfold). In contrast, even with the addition of the highest dose of Po, the
increase in plant growth, nodule formation, P acquisition, and BNF capacity (1.7, 3.5, 2.4 and 2.1-fold, respectively) was
much less expressed, indicating that hairy vetch could only minimally access Po sources over the growth period in order to
alleviate the P limitation effect on N2
fixation in under P-deficient conditions. These findings suggest that hairy vetch will not
be able to provide sufficient BNF for improving soil N inputs in low-fertility cropping systems that rely on organic inputs.},
organization = {Universita degli Studi di Torino within the CRUI-CARE Agreement},
organization = {Cassa di Risparmio di Torino},
publisher = {Springer},
keywords = {Legume cover crop},
keywords = {Phosphorus deficiency},
keywords = {Phytic acid},
keywords = {Stable isotope dilution},
keywords = {Phosphatase activity},
title = {Can Organic P Inputs Alleviate P Limitation Effects on Nutrient Uptake and Biological N2‑Fixing Capacity of Hairy Vetch (Vicia villosa)?},
doi = {10.1007/s42729-022-01012-6},
author = {Said Pullicino, Daniel and Lizcano Toledo, Rodolfo and Fernández Ondoño, Emilia},
}