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Fluid Journal : Fluid Journal 1996-1998
2 Fluid Journal Summer 1998 Systems compared Yields. Average almond yields in response to K for the three irrigation systems were: 2,400 meat lbs/A for single-line drip, 2,445 meat lbs/A for double-line drip, and 2,619 meat lbs/A for micro-sprinkler. Average yield for the NonPareil variety was 2,213 meat lbs/A, and for the Butte variety significantly higher at 2,763 meat lbs/A. As seen in Figure 1, almond meat yields in 1997 were significantly different between treatments under the micro-sprinkler system. This was not the case in the single- or double-line drip irrigation systems shown in Figures 2 and 3. Note also that there was a consistent trend for all K treatments to give higher yields than control under the micro-sprinkler system. As K rates were increased, yields did not show a consistent trend, especially with injected K2SO4 and MKP. It is interesting to note that banded K2SO4 under micro-sprinkler produced good yields compared to other K sources and rates, but did not yield as well under the other two irrigation systems. This would be expected under the drip systems, since the irrigation water was not wetting the area where the K had been banded. Only winter rains would have wetted the soil and provided for some uptake of K early in the spring. Leaf concentration. Highest leaf K concentrations of more than 2.0 percent were recorded in April and October samples under the micro-sprinkler system. In general, leaf K concentrations were higher in April and October than in July, except for the double-line system where July and October concentrations were more similar. Leaf K concentrations reflect the K availability of fall banded fertilizer as April leaf levels were fairly high for all banded treatments. These levels dropped somewhat in the July leaf samples, and increased to some extent in the October leaf samples for all irrigation systems, but particularly in the micro-sprinkler treatments. There was a fairly consistent trend of leaf K concentrations to increase over control for all injected treatments under the single-line drip system. Banded treatments had somewhat higher K concentrations than control in April, but not in the July or October leaf samples. Leaf K concentrations were not significantly different in the April Figure 2. Almond meat yields from banded K2SO4 versus source and rate of K injected through single-line drip irrigation system at Nickels Soil Laboratory, Meyer, et al., 1997. Figure 3. Almond meat yields from banded K2SO4 versus source and rate of K injected through double-line drip irrigation system at Nickels Soil Laboratory, Meyer, et al., 1997. 0 2,100 Lbs. K O/tree 2 2,200 2,300 2,400 2,500 2,600 2,700 2,800 Lbs meat/A Banded KSO 24 KSO 24 MKP KTS KCI 1*2*1#2#1!2 1o 4 * # O 0 2,200 Lbs. K O/tree 2 2,300 2,400 2,500 2,600 2,700 2,800 Lbs meat/A Banded KSO 24 KSO 24 MKP KTS 1* 2* 1# 1! 2 * #
Fluid Journal 1993-1995
Fluid Journal 1999-2001