ently maintain or very quickly recover P and water uptake capacity. This behaviour is consistent with an The effects of prolonged exposure to dry surface soil overall rooting strategy where essentially no surface on the capacity of roots to take up water and phosroots are shed following prolonged exposure to dry phorus were examined in mycorrhizal sour orange soil. (Citrus aurantium L.) seedlings grown in pots with upper and lower portions separated hydraulically. In Key words: Drought, split-root, 32P, citrus, uptake kinetics, the first experiment, upper portions of the pots were phosphorus uptake, water uptake, sour orange, Citrus either irrigated every 2-3 d, droughted for 14 d, aurantium. droughted for 43 d, or droughted for 42 d followed by 8 d re-irrigation. Lower portions of the pots were irrig-
Because the timing and amount of N fertilizer applications are important in producing high yield in cotton (Gossypium hirsutum L.), determining changes in plant N status is a valuable management tool. This study evaluated the Spectrum Technologies CM-1000 chlorophyll meter as compared with the GER model 1500 spectroradiometer for remote estimation of leaf chlorophyll concentration (Chl) under N-deficit conditions. In both instruments, measurements of leaf reflectance (R) at 700 and 840 nm (± 5.0 nm) were used to compute R 840 /R 700 , a measure associated with general plant stress. Plants were grown outdoors in large pots using half-strength nutrient solution (control) via a drip-irrigation system until some three-row plots received a restricted supply of N. Treatments comprised control N from emergence to maturity, 20% of control N at first floral bud (square) onward, and 0 and 20% of control N at first flower onward. Following 27 July 2000, treatment rankings for Chl and N were control > 20% N first flower > 0%N first flower ≥ 20% N first square. On most sampling dates, significant linear correlation was obtained between Chl and R 840 /R 700 across N treatments, particularly in August (r =0.55-0.93), when stress-induced changes in Chl were 171
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