Agronomic Effectiveness of Zinc Sources as Micronutrient Fertilizer

Zoysiagrass has great potential for use in the Gulf Coast states as a turfgrass. There has been minimal research on the nitrogen (N) and potassium (K) fertility response of zoysiagrass and the effect on turf color, quality, and nutrient content. The objective of this study was to evaluate the effects of N and K fertility on zoysiagrass. A study was conducted on three zoysiagrasses: Zoysia japonica × Z. tenuifolia Willd. ex Trin. (`Emerald'); Z. japonica Steud. (`Meyer'); and Z. matrella. The N and K treatment combinations consisted of high (H) and low (L) rates of N and K at the following levels: N levels of 454 and 227 g N/92.9 m2 per month and K levels of 454 and 227 g N/92.9 m2 per month. The treatment combinations were (N and K): HH, HL, LH, and LL and were applied in two split applications monthly from July through November. The study was a randomized complete-block design with three replications. All plots received two applications of a micronutrient fertilizer (late June and August), were irrigated as needed, and maintained at a height of 3.8 cm. Color, density, texture, uniformity, and quality were determined visually for each month. Plant tissue samples were collected (September) and analyzed for macronutrient and micronutrient contents. There were significant differences for color, density, and quality in the following months: September (color and density); October (quality); and November (color and quality). There were differences in leaf texture for all months. There were significant differences for N, magnesium (Mg), and K contents but there were no differences for any micronutrient. This study indicated that all three zoysiagrasses provided acceptable color and quality during the summer and fall, and that N and K rates affected N, K, and Mg contents in the plant.

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Application of Iron Oxide Nanoparticles as Micronutrient Fertilizer in Mulberry Propagation

Journal of Plant Growth Regulation ◽

10.1007/s00344-021-10413-3 ◽

2021 ◽

Author(s):

Md Salman Haydar ◽

Suravi Ghosh ◽

Palash Mandal

Keyword(s):

Iron Oxide ◽

Iron Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Micronutrient Fertilizer

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Zinc concentration of navy bean seed as affected by rate and placement of three zinc sources

Journal of Plant Nutrition ◽

10.1080/01904169609365209 ◽

1996 ◽

Vol 19 (10-11) ◽

pp. 1413-1422 ◽

Cited By ~ 8

Author(s):

J. T. Moraghan

Keyword(s):

Zinc Concentration ◽

Bean Seed ◽

Navy Bean ◽

Zinc Sources

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The agronomic effectiveness of reactive phosphate rocks 1. Effect of the pasture environment

Australian Journal of Experimental Agriculture ◽

10.1071/ea96108 ◽

1997 ◽

Vol 37 (8) ◽

pp. 921 ◽

Cited By ~ 7

Author(s):

P. W. G Sale ◽

R. J. Gilkes ◽

M. D. A. Bolland ◽

P. G. Simpson ◽

D. C. Lewis ◽

...

Keyword(s):

North Carolina ◽

Phosphate Rock ◽

Surface Soil ◽

Annual Rainfall ◽

Triple Superphosphate ◽

Agronomic Effectiveness ◽

P Sorption ◽

Reactive Phosphate ◽

Reactive Phosphate Rock ◽

Very High

Summary. The agronomic effectiveness of directly applied North Carolina reactive phosphate rock was determined for 4 years from annual dry matter responses at 26 permanent pasture sites across Australia as part of the National Reactive Phosphate Rock Project. Fertiliser comparisons were based on the substitution value of North Carolina reactive phosphate rock for triple superphosphate (the SV50). The SV50 was calculated from fitted response curves for both fertilisers at the 50% of maximum yield response level of triple superphosphate. The reactive phosphate rock was judged to be as effective as triple superphosphate in the 1st year (and every year thereafter) at 4 sites (SV50 >0.9), and was as effective by the 4th year at 5 sites. At another 9 sites the reactive phosphate rock was only moderately effective with SV50 values between 0.5 and 0.8 in the 4th year, and at the final 8 sites it performed poorly with the 4th year SV50 being less than 0.5. Pasture environments where the reactive phosphate rock was effective in the 1st year were: (i) those on sandy, humic or peaty podsols with an annual rainfall in excess of 850 mm; (ii) those on soils that experienced prolonged winter inundation and lateral surface flow; and (iii) tropical grass pastures in very high rainfall areas (>2300 mm) on the wet tropical coast on North Queensland. The highly reactive North Carolina phosphate rock became effective by the 4th year at sites in southern Australia where annual rainfall exceeded 700 mm, and where the surface soil was acidic [pH (CaCl2) <5.0] and not excessively sandy (sand fraction in the A1 horizon <67%) but had some phosphorus (P) sorption capacity. Sites that were unsuitable for reactive phosphate rock use in the medium term (up to 4 years at least) were on very high P-sorbing krasnozem soils or high P-sorbing lateritic or red earth soils supporting subterranean-clover-dominant pasture, or on lower rainfall (< 600 mm) pastures growing on soils with a sandy A1 horizon (sand component >84%). No single environmental feature adequately predicted reactive phosphate rock performance although the surface pH of the soil was most closely correlated with the year-4 SV50 (r = 0.67). Multiple linear regression analysis found that available soil P (0–10 cm) and the P sorption class of the surface soil (0–2 cm), together with annual rainfall and a measure of the surface soil"s ability to retain moisture, could explain about two-thirds of the variance in the year-4 SV50 . The results from this Project indicate that there are a number of specific pasture environments in the higher rainfall regions of Australia where North Carolina reactive phosphate rock can be considered as an effective substitute P fertiliser for improved pasture.

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Influence of Recovery Treatments on Dicamba-injured Soybean

Weed Technology ◽

10.1017/wet.2021.63 ◽

2021 ◽

pp. 1-20

Author(s):

Brian R. Dintelmann ◽

Shea T. Farrell ◽

Kevin W. Bradley

Keyword(s):

Yield Loss ◽

Yield Losses ◽

Soybean Yield ◽

Injury Reduction ◽

Stages Of Growth ◽

Average Precipitation ◽

Injury Event ◽

Recovery Treatment ◽

Micronutrient Fertilizer ◽

Similar Yield

Abstract Non-dicamba resistant soybean yield loss resulting from dicamba off-target injury has become an increasing concern for soybean growers in recent years. After off-target dicamba movement occurs onto sensitive soybean, little information is available on tactics that could be used to mitigate the cosmetic or yield losses that may occur. Therefore, a field experiment was conducted in 2017, 2018, and 2019 to determine if certain recovery treatments of fungicide, plant growth hormone, macro- and micronutrient fertilizer combinations, or weekly irrigation could reduce dicamba injury and/or result in similar yield to soybean that was not injured with dicamba. Simulated drift events of dicamba (5.6 g ae ha−1) were applied to non-dicamba resistant soybean once they reached the V3 or R2 stages of growth. Recovery treatments were applied approximately 14 d after the simulated drift event. Weekly irrigation was the only recovery treatment that provided appreciable levels of injury reduction or increases in soybean height or yield compared to the dicamba-injured plants. Weekly irrigation following the R2 dicamba injury event resulted in an 1% to 14% increase in soybean yield compared to the dicamba-injured control. All other recovery treatments resulted in soybean yields similar to the dicamba-injured control, and similar to or lower than the non-treated control. Results from this study indicate that if soybean have become injured with dicamba, weekly irrigation will help soybean recover some of the yield loss and reduce injury symptoms that resulted from off-target dicamba movement, especially in a year with below average precipitation. However, yield loss will likely not be restored to that of non-injured soybean.

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