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The image currently used …

a real rice harvester

… doesn't show a rice harvester, but a standard half-track combine harvester built in Europe by Claeys/Clayson in the late 1960s. Please compare this image and that image for modern examples of such half-track combines.

Real "rice harvesters" look different, especially their cutting and conveying units work differently, see Commons and the Japanese article on rice harvesters for better images. Thanks --:bdk: 07:41, 2 ноября 2011 (UTC)

This is accurately a standard harvester? Typical rice harvesters are modifications of grain harvesters (this situation is not only in Russia but also, just for instance, in Netherlands). Externally they differ only in semi-tracked or tracked chassis. However, their construction is not identical to grain harvesters — threshing devices of rice harvesters have a special design, better adapted for harvesting rice. Vade Parvis 10:50, 2 ноября 2011 (UTC)

Sorry for the late reply.

First let me note that rice can be harvested with special rice harvesters as well as with small or large standard combine harvesters. Which kind of harvesting machine is used mainly depends on field sizes and on the actual type of rice farming (wet/flooded paddy fields vs. rather dry rice fields). Special rice harvesters are commonly used in many parts of Asia. Elsewhere (not necessarily, but often slightly converted) standard combine harvesters are predominantly used.

The image question: Yes, the M122 is a standard combine harvester, first branded Clayson (ex Claeys), and later sold as Clayson NH, or New Holland Clayson. The last M122s were built in the 1970s (or, under license, in the 1980s, can't tell exactly atm). See [1] for a short model diagram, and [2] for some related images (you might need to click around a bit there). Claeys/Clayson built the first self-propelled combine harvesters in the 1950s, and the M122 (together with the M133, and M135) was one of the more successful models.

Of course, this model, the M122, usually has four wheels. Track conversions of combine harvesters (not only of this model) were/are generally made for different uses, e.g. for rice farming, for farming on former moorland/bogs (other grain crops), for efficient large-scale farming (to be more independent of weather conditions at harvest time), etc. (Half-)tracked combine harvesters are not special for rice farming.

Today, new combine harvesters are often half-tracked by default due to the requirements of soil conservation (the increasing machine weight results in higher soil compaction), see for example rapeseed harvest in Germany, wheat harvest in England.

Generally, the term "rice harvester" is used in two ways:

1) as a technical term for a special type of combine harvester (as described in the Japanese article),

2) in colloquial language for any kind of harvester, just because it's used for harvesting rice.

Agricultural/technical articles commonly refer to the first meaning only, so illustrating an encyclopaedic article with a standard combine photo is a bit misleading.

Cheers --:bdk: 07:08, 13 января 2012 (UTC)

PS: There are nearly no rice fields in the Netherlands.

Thanks for the detailed explanation! Vade Parvis 07:12, 13 января 2012 (UTC)
P.S. With regard to soil conservation — in general, it's, as for me, very interesting that in Europe, largely because of these reasons, are returning to the idea of ​​half-track chassis.

If you're interested in this you'll find some relevant aspects e.g. at [3], [4], [5] (I was only able to find these few links in Russian regarding Claas' terra-trac system, but you'll probably find more information elsewhere). Other manufacturers like Case IH also offer partly tracked combines, see e.g. File:CaseIH 9120 Combine.JPG (Quadtrac track system). And there are other large and heavy ag machines like potato harvesters that make use of continuous track technology by some means or other. Anyway, the classic military "half-track" system/idea (you are primarly interested in, I guess) is different from modern agricultural uses in many details. --:bdk: 05:27, 14 января 2012 (UTC)