Evaluation of an Amino Acid Biostimulant to Hasten Turfgrass Recovery

2020

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ADDITIONAL INDEX WORDS. Agrostis stolonifera, fertilizer, golf, percent cover, turfgrass SUMMARY. The branched-chain amino acids (BCAA) leucine (L), isoleucine (IL), and valine (V) are synthesized in plants and are essential to growth in most organisms. These compounds can be absorbed by the plant when foliarly applied, but plant catabolism of BCAA is not completely understood. A recent study observed that BCAA applied in a 2:1:1 or 4:1:1 ratio (L:IL:V) increased creeping bentgrass (Agrostis stolonifera) shoot density compared with applications of equal urea nitrogen (N) at 3.03 lb/acre N. The present study investigated whether those increases could translate to a quicker establishment rate of creeping bentgrass grown from seed in standard greenhouse pots. The BCAA applications were compared with equal N applications using urea and a commercially available amino acid product. All N treatments were applied at 3.03 lb/acre N, per application and applied a total of four times on a 14-day interval starting 14 days after seeding. Measurements included final shoot density counts and root and shoot weights, as well as digital image analysis of percent green cover for each greenhouse pot every 7 days. No differences were observed after 70 days in shoot weight, or percent green cover between BCAA treatments and urea; however, BCAA 2:1:1 and 4:1:1 increased shoot density 21% and 30%, respectively, compared with urea, and were equal to the commercially available amino acid product. Applications of BCAA 4:1:1 also increased creeping bentgrass rooting weight by a factor of 7 compared with urea N.

mentioning

confidence: 99%

Utilizing Branched-chain Amino Acids for Increasing Shoot Density and Establishment Rate in Creeping Bentgrass

2020

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“…The lack of shoot weight increase could be due to some sort of plant growth regulating (PGR) function. In previous work, amino acid applications have been reported to affect endogenous plant hormone levels (Aamlid et al., 2017; Carbonera et al., 1989; Jones & Christians, 2011; Merewitz et al., 2012; Zhang et al., 2013), which demonstrates how amino acid applications can result in PGR activity.…”

Section: Resultsmentioning

confidence: 84%

“…***Significant at the .001 probability level. Carbonera et al, 1989;Jones & Christians, 2011;Merewitz et al, 2012;Zhang et al, 2013), which demonstrates how amino acid applications can result in PGR activity.…”

Section: Plant Biomassmentioning

confidence: 99%

Evaluating the use of the branched‐chain amino acids in combination with urea on creeping bentgrass at establishment

Intl Turfgrass Soc Res J

2021

The branched-chain amino acids (BCAA) leucine (L), isoleucine (IL), and valine (V) are synthesized in plants and essential to growth in most organisms. Research has shown that when foliarly applied, these compounds can be absorbed by the plant, however, plant catabolism of BCAA is not completely understood. A ratio of 4:1:1 (L:IL:V) applied at 3.4 kg-nitrogen (N) ha −1 was identified as the optimal application ratio for increasing creeping bentgrass (Agrostis stolonifera L.) shoot density, however, material incompatibility issues occurred when BCAA were applied at 8:1:1 and 12:1:1 in previous work. The objective of this study was to determine if shoot density could be further increased by using lower BCAA ratio rates in combination with urea and GreenNCrease to equalize N at establishment. Creeping bentgrass samples grown in sand-filled pots were subjected to N application (3.4 kg-N ha −1

“…(Hopkins & Woolley, 2019). Compared with mineral nutrition only, plant biostimulants were demonstrated to improve turfgrass performance (Aamlid et al., 2017; Zhang et al., 2013) in some research studies, including recovery from damage (Jones & Christians, 2011).…”

Section: Introductionmentioning

confidence: 99%

Glycerin‐based nitrogen applications for turfgrass growth

Intl Turfgrass Soc Res J

2021

The purpose of this study was to investigate the effects of a glycerin-based nitrogen source on lateral spreading and recovery from simulated injury in both creeping bentgrass (Agrostis stolonifera L.)(CB) and Kentucky bluegrass (Poa pratensis L.)(KBG) . To evaluate the effect on lateral spreading and recovery, applications of the glycerin-based N product (glycerin + N) were compared with equal urea-N applications using N application rates of 6.1, 12.2, and 24.4 kg N ha −1 . To test the effect of the N treatments on recovery from simulated turf injury, injury was imposed on mature stands of CB and KBG by a golf course cup cutter, and recovery was tracked via digital image analysis over time. In a separate study, effects on lateral stem growth were investigated by transplanting mature plugs of CB and KBG to plots containing no existing vegetation, and digital image analysis was used to track the outward spreading of the CB and KBG plugs over time. Both studies were repeated in time across 2 yr. Compared with urea-N, the glycerin + N treatments resulted in increased turf injury recovery of CB and KBG by 43.9 and 44.7%, respectively, when applied at 24.4 kg N ha −1 . Additionally, the glycerin + N treatments resulted in increased spreading of vegetative plugs by 60.25% and 53.7%, respectively, in CB and KBG when applied at 24.4 kg N ha −1 . The glycerin+N material may be a valuable tool for turf managers for increasing the rate of recovery in CB and KBG following damage. INTRODUCTIONCreeping bentgrass (CB) (Agrostis stolonifera L.) and Kentucky bluegrass (KBG) (Poa pratensis L.) are two economically important cool-season turfgrass species. Creeping bentgrass is typically used for the game of golf, where it can be found anywhere from putting greens to tee boxes and fairways (Christians et al., 2017). Creeping bentgrass does well in these situations because it tolerates low mowing heights extremely well and provides a uniform surface that works well for the game of golf (Beard, 2001). Kentucky bluegrass is used for athletic fields that serve as the playing surface for sports such as football, lacrosse, soccer, field hockey, and Abbreviations: CB, Creeping bentgrass; KBG, Kentucky bluegrass.