Effects of slash and litter management and fertilizer practices on growth and soil chemical properties of Eucalyptus hybrid (E. urophylla × E. pellita)
Keywords:
Plantation site management, multi-rotation plantation management, degraded plantation forest land,, Eucalyptus urophylla × E. pellitaAbstract
Decline of yield and soil fertility of eucalypt plantations are associated with unsustainable site management practices. This study tested the simultaneous effects of fertilizers and slash management on growth and soil properties of 3-year-old Eucalyptus hybrid (E. urophylla E. pellita) planted on degraded land after several rotations of eucaltypt plantations in Yen Bai and Quang Tri provinces. The growth data collected annually from ages 1 to 3 showed that application of fertilizers based on specific demand of the trees have a significant effect on growth rate. Fertilizer mixed from single elements including micronized organic fertilizers, urea, super phosphate and potassium fertilizers have the best growth rate compared to the NPK fertilizers
commonly used in practice. Applying microorganism inoculated products has better effect on phosphorus mineralisation and cellulose decomposition into available minerals for plant uptake, but with poorer growth rate due to lack of fertilizer application. The growth rate was not significant different between the slash and litter burning and non-burning treatments for land preparation. Soil organic carbon and some soil chemical properties such as
pH, nitrogen and phosphorus have significantly changed after tree planting. Total soil organic carbon and nitrogen increased slightly after tree planting due to decomposition of organic matters from slash and litter, but in the second and third years, they decreased significantly. Extractable phosphorus continuously reduced since tree planting, which is associated with soil phosphorus immobilisation. There is not significant different in the soil properties between the burned and non-burned treatments and between fertilizer treatments up to 3 years of ages
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