8.18.14 Raw yield data from small plot study in Burbank field shows strong edge effect and weak treatment effect.
8.11.2014 Bulking curve and preliminary yield grades for Burbank 0N and bulk field fields as well as bulk field 2 and lealah fields. Small plot harvest is scheduled for Monday August 18th.
[gview file=”http://wisa.cals.wisc.edu/wp-content/uploads/2014/06/potato-yields-2014-8.11.2014.pptx.pdf”] [gview file=”http://wisa.cals.wisc.edu/wp-content/uploads/2014/06/potato-bulking-curve-2014-8.11.2014.pdf”]
8.6.14 Updatd bulking curve for Burbank field 2 and Lealah Field with tubers graded by size. Final harvest is slated for the Last week of August ( in three weeks). According to the field agromoist, the fields will be vine killed late August, early September. I want to get the samples collected before my help goes back to class. Tuber bulking is slowing down. The lealah field samples show a end to bulking, but that may be due to one low subsample. Ignoring the low subsample, the yield curvecontinues on the same bulking trend. Burbank 2 has green vibrant vines. However, Burbank 1 with the same fertility plan across the road is showing vines dying early – right now about 1 in 100 plants. In the No-fertigation corner, it is closer to 1 in 10 plants have died. The agronomist stated this may be due to poor fumigation last fall. At this point, the majority of tubers are small, between 113 and 285 grams.
ESN release has been updated as well.
7.28.14 Updated bulking curve for Burbank field with ESN and 0N control. 90 days after planting and 60 days post emergence.
7.18.14 ESN release curve update. Cooler than average weather has lead to a plateau in ESN release. First water collection from the PCS study in Neekosa. A total of 39 of 40 PCS had water in them. The clip holding the tube closed had fallen off the one PCS without water.
Potato yield checks on ESN fields.
7.7.14-7.9.14 PCS installation at Elseen field in Nekoosa. Installed 40 PCS to collect soil water under sweet corn with two rates of applied nitrogen.
7.1.14 New ESN release data. After an huge initial release of nitrogen in the 10 days after application, the ESN that had been blended with other soluble fertilizers has slowed down and has a similar N-release rate as the dealer grade ESN applied at the same time. The intial release burst may have been larger had there not been a cooling trend in soil temperature – dealer grade ESN applied earlier in the season shows a reduced release rate for the period between May 31 and June 10 when soil temperatures decreased from 70 (F) to 65 (F), and an increased release rate in the period from June 10 to June 26 as soil temp warmed back up. [gview file=”http://wisa.cals.wisc.edu/wp-content/uploads/2014/06/ESN-release-1.Jul_.14.pdf”] 6.23.14-6.26.14 Large lysimeter install at HARS with Bill Bland, Mingwei Yuan and Clay Vanderleest. Ruark crew helped out installing the 12 lysimeters. Mack returned on Thursday to give a hand overseeing planting, and hand planting the center row (the entire length centered over the boxes.)
Single pass Lysimeters hold approximately one-cubic meter of soil. Dimensions are 75 cm wide by 200 meter long with a pitched bottom angling from 70 cm to 80 cm at the deep end, the bottom is also angled two ward the center with a 5 cm pitch from each side, for example 80 cm to 85 cm. 6.20.14 There is very little NO3-N in the soil early in the season. Somewhere between ten and twenty pounds per acre in the top three feet. Preliminary soil NO3-N results for deep cores and composite PPNT (0-8 inch depth). The composite PPNT samples were taken from each grid-section (see picture). The PPNT and the top foot of the deep core cover the same NO3-N range for all the. I expect an occasional high or low sample from the deep cores, as they are a point sample and there can be very localized high or low concentration with in the field. We can see an example of that in the results from Werner S. I will convert the concentration (ppm NO3-N) to pounds N when I get the bulk density information put together. In the mean-time, the general rule of thumb to convert ppm to pounds per acre is to multiply the ppm by two to get lbs per acre. (http://corn.osu.edu/newsletters/2012/2012-03/converting-pounds-per-acre-to-parts-per-million-on-soil-test-report). [gview file=”http://wisa.cals.wisc.edu/wp-content/uploads/2014/06/Prelim-2014-Spring-NO3-N-and-deep-cores-Shop-N-Werner-N-Werner-S.pdf”] 6.19.14 Collected the first round of biomass samples from the three potato fields: Shop N, Werner S, and Werner N. Five root feet of whole plant as above ground biomass (AGB) and below ground biomass (BGB). Tubers ranged from budges in the root stem to half dollar size tubers on one plant, most were dime sized. Tubers were between the soil surface and the seed piece. Leaflets and petioles were all collected. All samples were collected in triplicate. Shop N and Werner S do not have a control section. Werner N has three 35-foot long by 24 row wide 0-N patches – gaps between small plots for the pivot irrigator’s wheel tracks. Samples are currently in the plant dryer at the Soils building. Petioles and leaflet samples will be ground and sent to SPAL for NO3-N analysis as soon as possible. Petiole, leaflet and whole plant sample will be sent to Horticulture’s Arlington Lab for total N analysis as a single group of samples or when Armand has time. The first resin rain gauge rinse was collected today. The gauges have been out in the field for 30 days.
6/16/2014: ESN mesh bag update: Release curve for ESN from fertilizer blend and dealer grade ESN. There are two mesh bag studies. The first is just dealer grade ESN in mesh bags put out at hilling to show ESN N-release over time. The second is a mesh bag study using ESN from fertilizer blend. ESN that has been blended with other soluble fertilzers can be damaged and have a faster release rate than undamaged ESN. We have used the 24-hour water test to indicate if ESN was damaged- however this is the first year we have used the ESN from blend in a mesh bag study. The ESN pells were removed from the ESN-KCl-AMS by hand. Because it takes time to get the fertilizer sample and to seperate out the ESN, the mesh bags did not get put out until 36 days after planting. ESN from the blend is show in the solid black diamonds. Dealer grade ESN (undamaged) is shown in red line diamonds. At ten days after being installed in the field, the blend ESN is 54% released (SE = 5.5%), the dealer grade ESN is 20% released (SE = 2.2%). [gview file=”http://wisa.cals.wisc.edu/wp-content/uploads/2014/06/6.16.14_ESN_blend_release.pdf”] 6/11/2014: Werner N field site: Collected ESN release bags, ESN Blend release bags, above ground biomass, belowground biomass, soil tempeature readings. [gview file=”http://wisa.cals.wisc.edu/wp-content/uploads/2014/06/2014-ESN-release-soil-temp-and-canopy-closure1.pdf”]