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Fluid Journal : Fluid Journal 1993-1995
2 Fluid Journal Spring 1995 Planting Dates May 10 May 20 May 31 June 10 Yields - bu/A 3,400 3,200 3,000 2,800 2,600 2,400 2,200 2,000 Across Bill Z Midland Varieties Pinto Navy Across Bill Z Midland Varieties Pinto Navy 3,400 3,200 3,000 2,800 2,600 2,400 2,200 Yields - lbs/A None 20+0+0 20+20+0 20+20+1 20+20+1* *Broadcast Fertilizer Treatment: (N, P, Zn) Figure 1. Yield response of dry-bean varieties to planting date at Powell, Wyoming, Blaylock, 1994. Figure 2. Effect of fertilizer source on dry-bean yields at Powell, Wyoming, Blaylock, 1994. collected to verify this observation. The combination of cold, wet soil early, Fusarium root rot, and hot, dry winds during flowering is the likely cause of lower yields in this planting. Starters boost yields Starter fertilizer treatments significantly affected early growth and final yield. There were significant yield increases with 20 lbs/A of N with starter alone, plus further incremental increases with the addition of P and Zn to the starter (Figure 2). Highest yields were produced with the combined N-P-Zn starter, but there was no response to the same nutrient combination when it was broadcast before planting. Early dry matter was primarily a response to starter N, because differences among banded starter treatments were relatively small compared with the response to the N starter alone. Yield responses to starters in this study occurred in spite of ade-quate soil test P and Zn levels. Although R8 dry matter was not significantly affected by fertilizer, larger plants early in the season seemed to relate to greater yields. Development/maturity impact Planting date. Similar to 1993 studies, days from planting to flowering, flowering to maturity, and planting to maturity decreased with later planting date. Differences in days- to-flowering were a result of a more rapid emergence and not a difference in days from emergence to flowering. Maturity differences observed in response to planting date were accounted for by differences in emergence time and days from flowering to maturity. Data indicated that later planting favors more rapid plant growth and development, but not enough to make up for differences in planting time. In most years in northern Wyoming, beans planted on June 10 would not be expected to mature and produce a harvestable crop. Fertilization. Maturity was signifi-cantly affected by fertilizer treatments, but mean differences were one day or less. Although statistically significant, these differences would be considered negligible under normal field practices. In previous research, Zn
Fluid Journal 1996-1998