Effect of Preplant/Early Irrigation, Nitrogen and Population Rate on Winter Wheat Grain Yield Plant and Soil Sciences Department, Oklahoma State University,

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O K L A H O M A S T A T E U N I V E R S I T Y Rationale N. Macnack¹, J. Kelly², J. Mullock¹, I. Ortiz-Monasterio 3, and W. Raun¹. ¹Plant and Soil Sciences,
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Effect of Preplant/Early Irrigation, Nitrogen and Population Rate on Winter Wheat Grain Yield Plant and Soil Sciences Department, Oklahoma State University, 368 Agricultural Hall, Stillwater, OK Contact: Rationale Objective Introduction Materials and Methods Results Conclusions Sulochana Dhital 1, Jeremiah Mullock 1, Bruno M Figueiredo 1, Tyler Lynch 1, Jagmandeep Dhillon 1, Mariana Ramos Del Corso 1 and William Raun 1 Ground water is the main source of irrigation water in Oklahoma. More precise and efficient utilization of water is needed. Deficit irrigation is an alternative practice in winter wheat management to compensate for the declining ground water resources and cost of pumping (Musick et al., 1994; Eck, 1988). Most of the wheat producing acres in Oklahoma are rainfed. The High plains of Oklahoma utilizes groundwater from the Ogallala aquifer for irrigation. Preplant or early irrigation in winter wheat can improve plant stands and lead to higher grain yields. Optimum seeding density efficiently utilizes resources and optimizes yield. To evaluate the differences in yield, tiller count, grain N, and Nitrogen Use Efficiency in early irrigated vs. non irrigated winter wheat. Fig. 1. Total monthly rainfall and Average monthly air temperature, ( and ). Fig: Left and right (Irrigated and Rainfed wheat ( ), seed rate 112 kgha -1 respectively ) Irrigated Rainfed Fig.2. Total number of tillers and head per m -2 winter wheat ( ), Stillwater, OK. Fig.3. Grain yield response to seeding rate and N rate treatments in and , Stillwater OK. Year had higher tiller counts and head counts for rainfed treatments (Fig.2). Also grain yield was higher for rainfed treatments whereas grain yield was higher in irrigated plots in (Fig.3). Table 1. Analysis of variance for grain yield, harvest index, grain N, head count, and tiller counts in and References Musick, J. T., O. R. Jones, B. A. Stewart, and D. A. Dusek, Water-yield relationships for irrigated and dryland wheat in the US Southern Plains. Agron. J. 86(6), Eck, H. V., Winter wheat response to nitrogen and irrigation. Agron. J., 80(6), Source of VariationDF YieldHIHeadGrain NYieldTillerHeadGrain N Pr > F Moisture1ns ** SR2*ns***ns **ns Moisture*SR2ns NR2*ns **ns ** SR*NR4ns Moisture*NR2ns * Moisture*SR*NR4ns * Significant at P = ns, not significant at P =0.05 **Significant at P = Seed rate was significantly different for yield level, head count and grain N for N rate influenced yield. For moisture was significantly different. Moisture impacted yield level, tiller count, head count and grain N. N rate increased grain N. Seed rate was highly significant for number of heads. Moisture and N rate interaction was significant for tiller counts. Although, tillers and head count data was higher for the higher grain yield in rainfed plots, they were not correlated with grain yield. Higher rainfall over the growing season in limited observing treatment differences (Fig.1). In both years, higher May-June rainfall decreased yield levels below normal. NUE values were extremely low. Early irrigation can help but for this study did not impact yield differences due to adequate rainfall received during the growing season