تأثير الري الناقص و السماد البوتاسي في حاصل الحبوب للذرة البيضاء

الملخص EN

Two field experiments were conducted during spring seasons of 2012 and 2013 on the fields of State Board of Agric., in Abu- Ghraib, to study the effect of deficit irrigation and levels of potassium fertilizer on yield and their components of sorghum (Sorghum bicolor L.

Moench).

A split plot in randomized complete block design was used with three replications.

The four irrigation treatments: full irrigation (T1) and three deficit irrigation treatments, holding irrigation on non-consecutive irrigations during different growth stages (T2, T3 and T4) were allocated to the main plot.

Whereas, the subplot were used the application of potassium fertilizer (0, 50, 100 and 150) Kg K.ha-1 as potassium sulfate.

The result showed that full irrigation treatment (T1) was significantly superior in all studied traits: No.

of grain per plant (2715.0 and 2656.0), weight of 500 grain (12.55 and 12.34) gm, grain yield (4.540 and 4.366) t.ha-1, biological yield (16.80 and 16.66) t.ha-1, harvest index (27.24 and 26.24)% and protein percentage (13.92 and 13.61)% for two seasons respectively compared with other deficit irrigation treatment.

The potassium fertilizer levels had significant effect in all studied traits; the level 150 Kg K.ha-1 gave highest mean for: No.

of grain per plant (2695.4 and 2684.0), grain yield (4.301 and 4.249) t.ha-1 and biological yield (16.05 and 16.13) t.ha-1 for two seasons respectively, and protein percentage (13.48%) in the second season only, while the level 50 Kg K.ha-1 gave highest mean for weight of 500 grain (12.31 and 12.01) gm for two seasons respectively, and the level 100 Kg K.ha-1 gave highest mean for harvest index (26.70 and 26.52)% for two seasons respectively, and protein percentage (13.76%) in the first season only.

The interaction between two factors was significantly in all studied traits.