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eliminating excessive fertilizer applied to vegetated row middles, allowing only the fertilizer N applied in the vegetation-free strip to meet the tree’s N demand. Application method and placement can improve the efficiency of applied N per unit of yield

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predominant grass weed, torpedograss, spreads vegetatively through underground stolons as opposed to seedlings, which can be suppressed by mulches. In general, mulch type had no effect on the numbers of any type of weed. Likewise, fertilizer placement above or

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) evaluated the effect of fertilizer placement on crop quality and weed growth in containers. They found a species-specific response in crop growth to the placement of CRFs and less weed growth in treatments using dibbled CRF (i.e., all fertilizer placed

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prescriptive variable rate nutrient application. Variable rate application technologies Variable rate application of granular fertilizers allows improved placement in root zones and rate matching of fertilizers to crop requirements ( Schumann et al., 2006a

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conditions, such as a high water table, low soil organic matter, and high fertilizer rates ( Bonczek and McNeal, 1996 ). The objective of this publication is to summarize the factors influencing nutrient release from CRF, and their appropriate placement, rate

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, the additional K supplied as K 2 SO 4 should not affect yields. In T8 (PCU120T) of 2011, fertilizers typically placed BIR were rototilled into the false bed before bed formation. The rototilling placement was removed as a treatment in 2012. In 2012

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Abstract

The response to surface placement of Nitrogen and Potassium fertilizer materials at: 1) dripline, 2) inside and 3) broadcast was observed for 5 years. Inside placement of equal or lesser amounts of fertilizer was as effective, and at times more effective, than dripline or broadcast placement. It appears possible that herbicides and fertilizer may be applied close to the bole of the tree in a single operation.

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Fertilizer placement under plastic was studied on 2 tomato cultivars (`TI-130' and `Floradade') during 1989. Treatments were 1, 2 or 3 increments of fertilizer broadcast, banded, broadcast/banded of banded with 1 or 2 sidedressings and a check. Fertilizer applied was NPK at 135-90-84 kg·ha-1 as a ammonium nitrate, triple superphosphate and muriate of potash, 10cm to each side of the plants and 10cm deep. Vine, total, marketable and early yields for lower rates either Br or Ba were as good as those of the full rate Br or Ba with 2 sidedressings (Ba/SD2). Leaf N, P, K, Ca and Mg for `TI-130' were not affected by placement. The Ba/SD2 placement Increased leaf N for `Floradade' but leaf Ca was reduced in all treatments vs the check. Leaf Mn was increased markedly by placements involving broadcasting at all rates.

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The effects of fertilizer placement and soil moisture level on soil N movement, uptake, and use by tomato plants (Lycopersicon esculentum Mill) grown with drip irrigation and plastic mulch were evaluated at two locations on two types of sandy soils. Broadcast or band fertilizer placement had no effect on fruit size, fruit number, or total yield. Fruit size was increased at one location, and the incidence of blossom-end rot was decreased by increased frequency of irrigation. Nitrate-N distribution within the bed was not affected by initial N placement. In the soil with a rapid infiltration rate, NO3-N levels in the center of the bed were always low, with highest concentration observed in the areas of the bed most distant from the drip tube. In the soil with the slower infiltration rate, NO3-N concentrations were more uniform throughout the bed, with highest concentrations in the bed center: Increasing soil moisture levels (–20 kPa vs. –30 kPa) resulted in increased leaching and reduced NO3-N concentration throughout the bed. Foliage N concentration was not affected by N placement, but decreased seasonally. Total N uptake by the above-ground portion of the plants was not affected by fertilizer placement or soil moisture level.

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Abstract

Plant growth and fruit yield were enhanced by broadcast as compared with band applications of either N-P-K fertilizer or micronutrients. Plant dry wt were similar with applications of either CuSO4-5H2O at 4 and 8 lb./acre Cu or complete micronutrient frit (FTE 503) at 30 and 60 lb./acre in 2 seasons. In 1 season, fruit yields were significantly higher where CUSO4 was used. Increases in rate of either micronutrient source resulted in increased fruit yields where applications were broadcast but a decrease where banded. These responses to increased micronutrient rates were related to an increase in micronutrient efficiency with the broadcast placement and to a toxicity with the band placement.

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