Impact of fertilization on chestnut growth, N and P concentrations in runo water on degraded slope land in South China
ZENG Shu-cai1, 1, 2, 2, , CHEN Bei-guang , JIANG Cheng-ai , WU Qi-tang
DOI:
Received August 06, 2006,Revised November 13, 2006, Accepted , Available online
Volume 19,2007,Pages 827-833
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Growing fruit trees on the slopes of rolling hills in South China was causing serious environmental problems because of heavy
application of chemical fertilizers and soil erosion. Suitable sources of fertilizers and proper rates of applications were of key importance
to both crop yields and environmental protection. In this article, the impact of four fertilizers, i.e., inorganic compound fertilizer, organic
compound fertilizer, pig manure compost, and peanut cake (peanut oil pressing residue), on chestnut (Castanea mollissima Blume)
growth on a slope in South China, and on the total N and total P concentrations in runo waters have been investigated during two
years of study, with an orthogonal experimental design. Results show that the organic compound fertilizer and peanut cake promote the
heights of young chestnut trees compared to the control. In addition, peanut cake increases single-fruit weights and organic compound
fertilizer raises single-seed weights. All the fertilizers increased the concentrations of total N and total P in runo waters, except
for organic compound fertilizer, in the first year experiment. The observed mean concentrations of total N varied from 1.6 mg/L to
3.2 mg/L and P from 0.12 mg/L to 0.22 mg/L, which were increased with the amount of fertilizer applications, with no pattern of
direct proportion. On the basis of these experiment results, organic compound fertilizer at 2 kg/tree and peanut cake at 1 kg/tree are
recommended to maximize chestnut growth and minimize water pollution.
