The application of zeolite to soils increases cation exchange capacity, and as increases nutrient retention capacity. Imbalanced nutrient management is one of the reasons responsible for low yield of potato in Iran. This study was carried out in research field of Islamic Azad University; Arak Branch at central of Iran to evaluate effect of zeolite particles and phosphorus fertilizer on agro-physiological traits of potato via factorial arrangement based on randomized complete block design with three replications in 2011. The factors included four concentration of zeolite particles (0, 2, 4 and 6 t.ha-1) and three level of triple super phosphate fertilizer (75, 150 and 225 kg.ha-1). Result of analysis of variance indicated effect of different rate of zeolite on all measured traits (instead tuber dry weight) was significant, also chemical phosphorus treatment can affected the mean tuber weight, biomass yield and tuber dry weight significantly. Interaction effect of treatments on mean tuber weight and biomass yield was significant at 5% probability level. The number of stem per plant, mean tuber weight, tuber phosphorus concentration, tuber yield and biomass yield generally improved by increase zeolite rates. Mean of tuber weight, biomass yield and tuber dry weight increased linearly with increasing phosphorus fertilizer rate from 75 to 150 kg.ha-1, the trends of changes in mean of mentioned traits were reduced by high amount of triple super phosphate application (250 kg.ha-1) significantly. Finally according result of this research the highest biomass yield (58 t.ha-1) was achieved by use of 6.0 t.ha-1 zeolite and 150 kg.ha-1 triple super phosphates, therefore, with a lower consumption of phosphate fertilizer (up to 225 kg.ha-1) it can be saved fertilizer without any significant reduction in yield. تفاصيل المقالة

BACKGROUND: Humic acid is a natural polymeric composition which is produced as a result of decaying organic matters in soil, peat and lignin to increase crop product. OBJECTIVES: Assessment the effect of different irrigation regime and humic acid on red bean production and correlation coefficient between measured traits. METHODS: Current research was done via split plots experiment based on completely randomized blocks design with three replications. Main factor consisted irrigation halt at three levels (I1: Complete irrigation or control, I2: halt irrigation at flowering stage, I3: halt irrigation at pod stage) and humic acid foliar application dosages at three levels (H1: Control, H2: using 1.5 L.ha-1, H3: 3 L.ha-1 humic acid) belonged to subplots. RESULT: The effect of irrigation halt and humic acid on biological yield, seed yield, harvest index, number of pods per plant and seeds per pod and 100 seed weight were significant. Mean comparison result of interactions effect of treatments revealed the highest seed yield (3758.4 kg.ha-1) was in complete irrigation with 3 L.ha-1 humic acid consumption and the lowest one (2170.1 kg.ha-1) belonged to irrigation halt at flowering stage. So, this reduction in the irrigation at flowering stage was about 6% by consumption of 3 L.ha-1, and was improved to 38%. CONCLUSION: flowering stage is the most critical stage of growth of red beans in response to irrigation regimes and foliar application of humic acid could be used as a new method to decrease damage caused by halt irrigation, so halt irrigation in pod stage with use 3 L.ha-1 humic acid is recommended to achieve maximum yield. تفاصيل المقالة