جستجوی مقالات مرتبط با کلیدواژه « هدایت الکتریکی خاک » در نشریات گروه « زراعت »

In order to investigate the effects of compost and nitrogen on quantitative and protein content of forage corn and some physical and chemical properties of soil, a factorial experiment with 9 treatments in a factorial randomized complete block design has been conducted in the farm of Tehran Agricultural and Natural Resources Research and Education Center during 2014. The treatments include three levels of residual compost (0, 10, and 20 Ton.ha-1) and three levels of nitrogen (0, 100, and 200 kg.ha-1) as urea. The effect of municipal waste and nitrogen compost on yield and yield components has been significant. The use of municipal solid waste compost has significantly increased the electrical conductivity of soil, nitrate, iron, and zinc uptake, while significantly decreasing soil reaction. Waste compost application has also improved some soil physical properties. Bulk density is significantly reduced and field capacity and soil available water are increased. Therefore, in the similar soil conditions of this ersearch, the use of 200 kg.ha-1 of pure nitrogen from the urea source with 20 Ton.ha-1 of municipal solid waste compost is recommended to achieve the maximum dry forage yield of 21.44 tons per hectare.

Saffron (Crocus sativus L.) is a subtropical plant which is cultivated in Iran so far and its yield is strongly dependent on soil chemical properties. Zeolites are one of the substances which are used to improve soil characteristics and soil correction capability as well. To evaluate the effects of these minerals in some soil chemical properties (Na, K, Ca, Mg, Cl, SO4, HCO3, pH and EC) under saffron cultivation, a study was conducted at completely randomized design with seven treatments at the Agricultural Research Station, University of Birjand during 2012. Factors which examined in this study include type of Zeolites: calcic zeolite (Zca), potasic zeolite (Zk) and z-mix zeolite (Zs) in three levels: zero (Z0), 2 (M2) and 6 (M6) as wt% with 9 replications. These treatments were mixed with soil and were placed in pots with diameter 30 cm and height 35 cm. Soil sampling was done in depth of 10-20 cm at the end of crop season. Also, soil sampling was performed at two other depth layers (0-10 and 20-30 cm) for determination of soil EC. The results showed that the effect of zeolite was significant on bicarbonate concentration in soil solution (P< 0.05). Interaction effect of type and amount of zeolite was significant on Ca, Mg, Cl, HCO3, SO4 concentration in soil solution and pH as well (P< 0.05) and it affected on Na and total cations (P< 0.01), but the amount of Zeolite has no affect.