bill raun at oklahoma state university, who had been developing a handheld radiometer called a greenseeker. this device can assess nutrient needs in real time and help farmers optimize future nitrogen applications. the instrument calculates total average biomass and the amount of chlorophyll in the leaves, data linked to the overall health of the plants. armed with these real-time measurements, ortiz-monasterio helped develop a management strategy for nitrogen enrichment. on each plot, the first step is to establish a nitrogen-rich strip, a few hectares that have enough extra nitrogen applied to guarantee maximum crop yields. the nitrogen-rich strip has to represent a level of nitrogen that doesn't have any nitrogen deficiency. that's going to be our reference. once we have the nitrogen strip well established, around 45 days after planting, we come along with the sensor, and we take the readings in the n-rich strip, and then we take the readings in the rest of the plot. narrator: the readings are called in to a researcher, who calculates how much additional nitrogen fertilizer the farmer m

they've picked up a little more than one quarter of an inch of rain and will have to deal with the raun tonight into tomorrow. the showers were spotty in nature, and the system bringing in heavy rain tonight into tomorrow, spreading east into mon fanna and portions -- montana and the portions of the north central planes. later tonight a flood warning, going into monday afternoon, and we'll deal with the showers. that will place a hamper on the recovery efforts. >> objects pulled from the indian ocean this weekend did not come from the missing jetliner. ships and planes spot more debris in the southern indian ocean, where they believe the malaysia airlines went down. so far nothing has been connected to the airliner that disappeared. until something is found family members cling to hope. in kuala lumpur a vigil was hold for the passengers. others are angry. several dozen relatives held a protest demanding answers for the government and an apology for how the investigation has been handled. >> still ahead - deadly clashes in the streets of cairo, what set off a clash between college stude