Fertilizer Applications Affect Foliar Nitrogen, Chlorophyll, Shoot Growth and Yield of Qing Chinese Chestnut
Three different fertilizer treatments were applied in 2005 and 2006 at equivalent annual rates of nitrogen to determine their effect on growth and yield of Qing Chinese chestnut trees. Chlorophyll meter readings were also obtained to determine their relationship to foliar nitrogen. The fertilizer treatments were: 1) 150 kg N/ha in the form of slow-release fertilizer (ProGrow) applied on 1 Mar.; 2) 75 kg N/ha in the form of NH4NO3 applied on 1 Apr. and on 15 June; and 3) 75 kg N/ha applied on 1 Apr., 30 kg N/ha applied on 15 June, and 45 kg N/ha applied on 10 Oct. All in the form of NH4NO3. Qing trees treated with two applications of NH4NO3 resulted in greater yield and less terminal shoot growth than other fertilizer treatments in 2005. In 2006, yield was similar, but nut growth may have been influenced by adverse weather conditions. The SPAD502 chlorophyll meter readings had the strongest relationship to foliar nitrogen when mid-shoot leaves from current seasons growth were sampled in mid-June in both years. Thus, the SPAD meter may be a promising tool for the rapid assessment of foliar nitrogen of Qing Chinese chestnut trees and for the diagnosis of nitrogen deficiency.
Castanea mollissima chlorophyll meter foliar nutrition nut yield SPAD-502 meter
M.R.Warmund
Division of Plant Sciences University of Missouri Columbia,Missouri,65211 USA
国际会议
第四届国际板栗大会(Proceedings of Fourth International Chestnut Symposium)
北京
英文
451-455
2008-09-25（万方平台首次上网日期，不代表论文的发表时间）