Studied by 5 people
Macronutrient deficits
________ are the most common, with nitrogen, phosphorus, and potassium deficiencies being the most common.
ions
Positively charged ________ (cations) as potassium (K+), calcium (Ca2+), and magnesium (Mg2+) attach to negatively charged soil particles and are thus less easily lost by leaching.
rhizobacteria
Some ________ generate antibiotics, while others increase the availability of nutrients to plants.
agriculture
In ________, legume crops are cycled with other crops to replenish soil nitrogen.
Mycorrhizae
________ are mutualistic fungi- root connections.
Plant roots
________ take nutrients from the earth.
absorb water
Mycorrhizae's fungal hyphae ________ and minerals, which they then pass on to their plant hosts.
Topsoil
________ is a diverse environment teeming with bacteria, fungus, protists, animals, and plant roots.
atmospheric N2
Nitrogen- fixing bacteria convert ________ to nitrogenous minerals, which plants can use as a nitrogen source in organic synthesis.
Mechanical fracture
________ is caused by water freezing in rock fissures, and chemical fracturing is caused by weak acids in the soil.
Plant secretions
________ help the rhizosphere's energy demands.
Soil
________ is home to a live, diverse ecosystem.
Rhizobacteria
________ get their energy from the rhizosphere, a microorganism- rich ecosystem that is tightly linked to roots.
Plants
________ get the majority of their nitrogen via bacterial breakdown of humus and gaseous nitrogen- fixing.
