Android Market pulls more applications from its shelves than does Apple’s App Store, according to a new report from Research2Guidance.

The actual total number of applications published on the Android Market rose to more than 500,000 in September 2011. In the meantime, the Apple App Store stands at just over 600,000 successful submissions: just 20 percent more. But Research2Guidance found that over 37 percent of the applications published were later removed from the Android Market for various reasons, whereas the Apple App Store has removed just 24 percent of published apps in comparison, as of the end of September.

The report goes on to posit that more rigid application submission requirements at the App Store prevent developers from publishing multiple trial or low quality applications, whereas publishers in the Android Market post a lot of market testing, trials, demo and malware content.

According to the report, over 78 percent of the apps removed from the Android Market were free, which could mean that publishers put more effort into the applications they place with the pay-per-download business model, thus ensuring that it is kept longer in store.

Research2Guidance notes that the share of deactivated apps in the WP7 Marketplace today stands at just 13 percent. However, the WP7 Marketplace is a comparably young store and many publishers are still exploring its potential. Fifteen months after its launch (comparable to the WP7 store now), the Android Market similarly had 86 percent of its apps active and a significant application store clean-up didn’t get started until the end of 2010.

So which platform’s developers are more prolific? According to this report, the average publisher on Android has placed more than six applications in the Market since launch, compared to just over four apps on average that have been published by iOS developers.

Over the past few months, the Android Market has been maintaining an exponential growth, but it is still lagging behind the app store market leader, Apple. In Q3 of 2011, the number of active mobile applications in the Android Market stood at 319,161 compared to 459,589 in Apple App Store.