Method and Rate of Applying Zinc Sulfate for Corn on Zinc‐Deficient Soil in Western Nebraska 1

Field investigations were conducted to evaluate the response of corn (Zea mays L.) to residual Zn in Litz silt loam and to determine the level of Zn required to correct Zn deficiency in corn on Westmoreland silty clay loam. Corn yields were increased on the Litz soil in 1969, where 7 and 14 kg Zn/ha as broadcast ZnSO4, and 4.4 kg Zn/ha as broadcast Zn‐EDTA were applied in 1968. A lower level of broadcast Zn‐EDTA of 2.2 kg Zn/ha was inadequate to increase yield. The residual Zn from application of 14 kg Zn/ha as ZnSO4 increased yield to a greater extent than residual Zn from application of 4.4 kg Zn/ha as Zn‐EDTA. Residual Zn from application of 7 kg Zn/ha as ZnSO4 was intermediate between these treatments in increasing yield. More than 13.6 kg Zn/ha as broadcast ZnSO4 was required to correct Zn deficiency of corn on a Westmoreland silty clay loam.

Section: Yieldsmentioning

confidence: 83%

Response of Corn to Residual and Applied Zinc as ZnSO4 and Zn‐EDTA in Field Investigations¹

Schnappinger¹,

Martens²,

Hawkins³

et al. 1972

“…In addition, the early to mid‐vegetative phase applications could greatly impact the PNURs for Mg, Zn, and Mn before silking time and then consequently modify the ENARs. For Zn, Pumphrey et al (1963) demonstrated that preplant Zn application was effective in promoting early growth, and those benefits were translated into yield at the end of the season. More research should be performed to define optimum timing, rates, placement, and sources for applying micronutrients, considering each nutrient as an individual case.…”

Section: Resultsmentioning

confidence: 99%

Maize Nutrient Accumulation and Partitioning in Response to Plant Density and Nitrogen Rate: II. Calcium, Magnesium, and Micronutrients

Ciampitti

Vyn

2013

Maize (Zea mays L.) yields have advanced through breeding complemented with evolving management technologies including plant density (PD) and macronutrient fertilizer inputs. Little is known about management-induced changes in plant uptake or allocation of nutrients other than macronutrients. Therefore, impacts of both PD and N rate at three levels (low, medium, and high) on Ca, Mg, and micronutrient partitioning (for pertinent plant organs at six growth stages) were investigated at four environments in Indiana. Grain Ca, Mg, Fe, and Zn contents at maturity were primarily influenced by N rate, while the PD ´ N rate interaction influenced those of Mn and Cu. At the whole-plant scale, PD and N rate significantly influenced all nutrient contents, and vegetative-stage nutrient accumulation averaged 91% (Ca), 51% (Fe), 47% (Zn), and 73% (Mn, Mg, and Cu) of corresponding nutrient contents at maturity. During the vegetative phase, three modes of leaf vs. stem nutrient partitioning were: (i) preferential allocation of Mg and Zn to stems; (ii) preferential allocation of Fe and Ca to leaves; and (iii) isometric partitioning of Cu and Mn. Isometric nutrient concentration patterns between Mg and Zn were documented in leaf, stem (vegetative phase), and ear (reproductive phase). Early-reproductive-stage nutrient partitioning from plant to ear was greatest for Zn and Mg and mirrored their respective harvest indices (HIs) at maturity. Nutrient HIs, concentrations (grain + stover), and internal efficiencies at maturity were positively impacted by N rate but negatively by PD. Reliable micronutrient requirement estimations for maize under diverse management and yield levels help inform future balanced-nutrient input decisions.

“…Cool, wet environmental conditions that occur before the permanent flood is established may also exacerbate Zn deficiency of seedling rice, especially when rice is seeded very early (Norman et al, 2003). Although the flooded soil conditions used to grow rice play an important role in the occurrence and diagnosis of Zn deficiency, delaying Zn application until after crop emergence has also been shown to reduce yield potential of corn (Pumphrey et al, 1963). Once seedlings become Zn deficient, some minimum amount of time is likely needed for the uptake and translocation of foliar‐applied Zn and subsequent restoration of normal plant growth and metabolism.…”

Section: Discussionmentioning

confidence: 99%

“…Pumphrey et al (1963) showed that foliar application of ZnSO 4 to corn ( Zea mays L.) seedlings was generally less effective than preplant soil‐applied Zn. Wells et al (1973) reported the results of more than 20 Zn fertilization trials conducted in Arkansas, which included granular and liquid formulations of Zn applied across a wide range of Zn application rates and times.…”

mentioning

confidence: 99%

Effect of Zinc Source and Application Time on Zinc Uptake and Grain Yield of Flood‐Irrigated Rice

Slaton

Norman²,

Wilson³

2005

ers have inquired whether postemergence foliar applications of Zn at relatively low rates are better than preven-Zinc is the most common micronutrient fertilizer applied to rice tative applications of granular Zn applied at relatively (Oryza sativa L.) in the USA. Preventing yield limitations from Zn high rates. deficiency requires knowledge of the proper application rates and Zinc deficiency is the most common micronutrient times of commercial Zn fertilizers. The objective of this research was to evaluate the Zn nutrition and grain yield response of rice as affected deficiency of rice grown on neutral to alkaline soils in the by Zn-fertilizer source and application time. Four field trials were con-USA (Norman et al., 2003), as well as other rice-producducted to evaluate several Zn sources applied preplant incorporated ing regions of the world (Fageria et al., 2003). Slaton (PPI), delayed preemergence (DPRE), and postemergence (POST) et al. (2002b) reported that 79% (Ͼ600 000 ha) of the before flooding at the four-leaf stage. Zinc treatments included Zn soils used for rice production in Arkansas have soil solutions sprayed at 1.1 to 2.2 kg Zn ha Ϫ1 and dry-granular Zn fertiliz-pH Ͼ 6.0 and may require Zn fertilization for normal ers broadcast at 11.2 kg Zn ha Ϫ1 . Zinc-fertilizer source, averaged crop growth and yield. In Arkansas, Zn fertilization is across application times, significantly affected grain yield at all sites recommended for rice grown on silt and sandy loam with Zn fertilization increasing yields by 12 to 180% compared with soils that have soil water pH values Ն6.0 and Mehlich-3 the unfertilized control. Zinc-application time, averaged across Zn extractable Zn concentrations Ͻ3.5 mg kg Ϫ1 (Slaton, sources, significantly affected grain yield at only one site, which had severe Zn deficiency. Zinc applied PPI (6915 kg grain ha Ϫ1 ) and DPRE 2001; Slaton et al., 2002b). When recommended, Zn (7456 kg grain ha Ϫ1 ) produced similar yields that were greater than should be (i) applied to the soil before rice emergence Zn applied POST (5526 kg grain ha Ϫ1 ). Zinc solutions sprayed at 1.1as granular Zn at 11 kg Zn ha Ϫ1 , (ii) applied to seedling to 2.2 kg Zn ha Ϫ1 generally produced yields that were comparable with rice foliage at 1 to 2.5 kg Zn ha Ϫ1 at least 5 to 7 d before yields from granular fertilizers applied at 11.2 kg Zn ha Ϫ1 . Fertilization