To determine the appropriate sowing date of annual crops for green forage and silage in non irrigated condition were conducted the small field trials in Ikhtamir, Arkhangai (high mountain)andBayanchandmaniand Bornuur, Tuv (forest steppe)in 2006-2008.
For field experiments selected 8species (oat, rye, sudan grass, maize,sun flower, rape, pea and soy been) and sown in 4 different date as a June 5, June 15, June 25 and July 5.
In the experiments measured and observed the number of germs, green massat blooming and early seed maturing stages, height and developingstages.  
Data was analyzed with SPSS 16.0.
The meteorological data for 2007 and 2008 in high mountain zone shown that, the air temperature for growing season was usually higher comparing with LTA. Unfortunately, in June and Julyof2007 air temperature was higher in 3.6-4.6oCthan LTAand low precipitation. In 2008, the precipitation was lower in 30 mm than LTA.
In forest steppe zone in 2006, the air temperature was lower than LTA, but in 2007 and 2008  was over LTAand low precipitation.
Depending from sowing dates the blooming and early seed maturing dates of annuals different. By 2 years average in non irrigated condition in forest steppe zone the rape, pea and soy bean are able to blooming for all sowing dates from 5 of June to 5 of July. However,  rye sown later than 25th June and oat sown later than 15th of June could be bloom in end of August or  beginning of September and it would be risky to break by first froze. When sowing from 5 to 15 of June the sun flower, sudan grass and maize can be blooming in end of August and feasible to harvest for green forage.
Sowing later from 25th of June the harvest in early seed maturing stage for most annuals limited.
In high mountain zone also first fall usually in end of August and depending from low temperature in August the annuals impossible to develop to seed maturing stage (Table 1).
 
Table 1. Blooming and early seed maturing dates
# Species name Blooming Early seed maturing
5 June 15 June 25 June 5 July 5 June 15 June 25 June 5 July
Forest steppe zone
1 Rape 15 Jul 19 Jul 26 Jul 15 Aug 26 Jul 28 Jul 5 Aug 21 Aug
2 Pea “Vega” 26 Jul 3 Aug 9 Aug 19 Aug 5 Aug 15 Aug 18 Aug 29 Aug
3 Soy bean 2 Aug 9 Aug 15 Aug 25 Aug 16 Aug 24 Aug 31 Aug 0
4 Rye 5 Aug 13 Aug 19 Aug 31 Aug 25 Aug 30 Aug 9 Sep 0
5 Oat 16 Aug 21 Aug 27 Aug 9 Sep 26 Aug 29 Aug 8 Sep 0
6 Sun flower 16 Aug 23 Aug 29 Aug 4 Sep 24 Aug 30 Aug 8 Sep 0
7 Sudan grass 17 Aug 24 Aug 30 Aug 14 Sep 28 Aug 31 Aug 10 Sep 0
8 Maize 19 Aug 24 Aug 28 Aug 3 Sep 29 Aug 5 Sep 0 0
High mountain zone
1 Rape 10 July 6 Aug 12 Aug 20 Aug - - - -
2 Rye 31 July 18 Aug 22 Aug - - - - -
3 Oat 3 Aug 12 Aug 24 Aug - - - - -
4 Sudan grass 5 Aug 20 Aug 31 Aug - - - - -
5 Sun flower 15 Aug 25 Aug 30 Aug - - - - -
6 Maize 16 Aug 26 Aug 27 Aug - - - - -
 
 

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