GROWING THE ENDANGERED SPECIES Astragalus nitidiflorus IN THE NURSERY: FERTILIZATION RATE AFFECTS GROWTH, AND LEAF NUTRIENT AND CHLOROPHYLL CONTENTS
Maria José Vicente
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII, 48, 30203 Cartagena, SpainJuan José Martínez-Sánchez
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII, 48, 30203 Cartagena, SpainJosé Antonio Franco
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII, 48, 30203 Cartagena, SpainSebastián Bañón
Abstrakt
Astragalus nitidiflorus is an endangered legume endemic to the southeast of the Iberian Peninsula. This species develops symbiotic relationships with N-fixing bacteria. However, the problem of isolating its rhizobia has not been solved. Because poor N fixation in plants can be corrected by fertilization, the effect of N-P-K fertilizers on growth, leaf chlorophyll and mineral ions was studied. Plants of A. nitidiflorus were grown in 100%-substrate with different N-P-K fertilizer rates (mg l–1): 1-1-8 (S0), 69-29-35 (SL), 144-43-131 (SM) and 245-58-235 (SH). A treatment with substrate plus soil from the natural habitat and no fertilizers (T0) was included. The reference foliar contents of N, P and K were 42.5, 3.5 and 36.5 mg g–1, respectively. Although the species did not form root nodules when grown in substrate, T0 plants produced active nodules that allowed the plants to grow properly without fertilization. In the absence of nodules, both N fertilization (~144 mg l–1) and Fe fertilization (>12 mg l–1) are vital, as is, to a lesser extent, K fertilization (~75 mg l–1 K2O). The S0 and SL reduced leaf chlorophyll, while SM prevented its degradation.
Słowa kluczowe:
nutrition, nodulation, native plants, substrate, pot, nurseryDepartamento de Producción Vegetal, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII, 48, 30203 Cartagena, Spain
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII, 48, 30203 Cartagena, Spain
Departamento de Producción Vegetal, Universidad Politécnica de Cartagena (UPCT), Paseo Alfonso XIII, 48, 30203 Cartagena, Spain
Licencja
Artykuły są udostępniane na zasadach CC BY 4.0 (do 2021 r. na zasadach CC BY-NC-ND 4.0 międzynarodowe).
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Autor podpisuje oświadczenie o oryginalności dzieła, wkładzie poszczególnych osób i źródle finansowania.