Navigation Links
No consistent advantage for planting soybean early
Date:3/16/2009

MADISON, WI, March 16, 2009 -- Planting soybean on the optimum date produces maximum yield and profit without increasing production costs. Unfortunately, the optimum planting date is hard to indentify, because it varies from year to year, depending on the weather and how much it rains and when it rains.

"Planting date has been a favorite topic of researchers ever since soybean was introduced into the United States, so there is a large database of experiments in the literature. A combined analysis of this database will provide a clearer picture of the average response than any single experiment," explains Dr. Dennis Egli, University of Kentucky, Lexington.

Dr. Egli and colleagues at the University of Kentucky analyzed the combined results of planting date experiments and published their findings in the March-April 2009 issue of the Agronomy Journal.

The scientists analyzed combined results of planting date experiments from the Midwest (NE, ND, IA, IL, IN, and OH), the Upper South (AR, KY, MO, and TN), and the Deep South (AL, FL, GA, LA, MS, and SC). Planting dates varied from mid-April (early April in the Deep South) to July. The experiments included several varieties and several row spacings, but none were irrigated.

In spite of the differences in environmental conditions and varieties from the Midwest to the Deep South, the response of yield to planting date was remarkably consistent across the three regions. Average yield did not change as planting was delayed from mid-April until late May or early June. Thus, there was no evidence that April plantings produced higher yields in any of the three regions. Early April plantings were included in the Deep South and average yields decreased for these ultra-early plantings.

A previous study published in the Agronomy Journal [Vol. 101:131-139 (2009)] concluded that April and early May plantings in Indiana consistently produced the highest yield. But our results, based on the combined analysis of 28 experiments, show no significant advantage for such early plantings from the Midwest to the Deep South.

While the results of this analysis show no consistent yield advantage for planting early, there was also no consistent yield loss (except for ultra-early plantings in the Deep South) associated with early plantings.

"If the soil is ready for planting in April, producers should feel free to plant, but they shouldn't expect higher yield," advises Egli.

Planting into cold, wet soils, however, can reduce seedling emergence and stand, which may require replanting to avoid yield loss. Unacceptable stands may be more common if seeding rates are reduced to the minimum to reduce seed costs.

Average yield declined rapidly when planting was delayed after 30 May in the Midwest, 7 June in the Upper South, and 27 May in the Deep South at rates ranging from 0.7 (Midwest) to 1.1 (Upper South) and 1.2 ( Deep South) percentage points per day. At these rates, delays of just 2 weeks will reduce yields by approximately 10 to 20%.

There may be no particular advantage for early planting, but there was a clear disadvantage for planting late, after the critical date in late May or early June. Soybean producers can maximize their yield and profits by making sure planting is completed before the critical date.


'/>"/>

Contact: Sara Uttech
suttech@agronomy.org
608-268-4948
American Society of Agronomy
Source:Eurekalert

Related biology news :

1. Massive California fires consistent with climate change
2. Musicians have biological advantage in identifying emotion in sound
3. Take advantage of reduced pre-registration rates for the IOF World Congress on Osteoporosis
4. Harmful algae taking advantage of global warming
5. Vidalia onions: Alternative to hand-transplanting proven effective
6. Search for salt tolerant grasses aims to improve roadside plantings
7. Implanting embryonic cardiac cells prevents arrhythmias
8. Planting carbon deep in the earth -- rather than the greenhouse
9. Plant soybean early to increase yield
10. Soybean database will help breeders engineer better-performing plants
11. DOE Joint Genome Institute completes soybean genome
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/30/2017)... Trends, opportunities and forecast in this market ... (fingerprint, AFIS, iris recognition, facial recognition, hand geometry, vein ... use industry (government and law enforcement, commercial and retail, ... others), and by region ( North America ... Pacific , and the Rest of the World) ...
(Date:3/27/2017)... , March 27, 2017  Catholic Health ... and Management Systems Society (HIMSS) Analytics for achieving ... Adoption Model sm . In addition, CHS previously ... U.S. hospitals using an electronic medical record (EMR). ... its high level of EMR usage in an ...
(Date:3/23/2017)... , March 23, 2017 The report "Gesture Recognition ... Biometric), Industry, and Geography - Global Forecast to 2022", published by MarketsandMarkets, the ... a CAGR of 29.63% between 2017 and 2022. ... ... ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... BioMedGPS ... the addition of its newest module, US Hemostats & Sealants. , SmartTRAK’s US ... absorbable hemostats, fibrin sealants, synthetic sealants and biologic sealants used in surgical applications. ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... first-ever genomics analysis platform specifically designed for life science researchers to analyze ... pioneering researcher Rosalind Franklin, who made a major contribution to the discovery ...
(Date:10/11/2017)... ... October 11, 2017 , ... The ... context, enabling overexpression experiments and avoiding the use of exogenous expression plasmids. The ... transformative for performing systematic gain-of-function studies. , This complement to loss-of-function studies, ...
(Date:10/11/2017)... ... , ... ComplianceOnline’s Medical Device Summit is back for its 4th year. The ... Francisco, CA. The Summit brings together current and former FDA office bearers, regulators, industry ... officials from around the world to address key issues in device compliance, quality and ...
Breaking Biology Technology: