The effect of seeding rate on the formation of productive soft wheat straw on the background of mineral fertilizers

The effect of two main factors, i.e. the norms of seeds seeding and mineral nitrogen on the efficien-cy of zoned grade of soft wheat Navruz in the con-ditions of the Gissarsky valley of Tajikistan was considered. Studying the number of interstices (IS) of productive culm of wheat, their length and the ratio depending on agrotechnology factors was de-scribed. It was established that at the increase in the norm of seeding of seeds to 300 pieces on 1 sq.m and use of mineral nitrogen at the rate of 200 kg/hectare (in tucks) at the majority of productive culms it was formed on 5 interstices. Thus in com-parison with control option (without fertilizers) the culms with 3 interstices were missing. It was re-vealed that the increase in the norm of seeding of seeds leads to lengthening of productive culm, mainly at the expense of the increase in the length of two top interstices. At the same variety different ratio between number of interstices and their length was noted. So, the lengths of the first IS at culms with 3 IS were made by 9-9.5 cm, at culms with 4 IS - 5.23-7.42; and at culms with 5 IS - 1.67- 6.0 cm. The same regularity was noted and at sub-sequent IS, i.e. in the process of increase in the number of IS at productive culm the reduction of their length was observed. High correlation and variation connection between studied sign of pro-ductive culm in control option was established. The increase in the norm of seeds seeding and the in- fluence of mineral nitrogen lead to insignificant re-duction of this compounding.