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BEIJING, March 14 (Xinhua) -- As the weather turns warm, farmers across the country are busy with spring farming to lay a solid foundation for a bumper harvest

Surely the duo of drone and robot will work entirely autonomously when it comes to dispensing fertilizer it won't do it the conventional way back community standard practice until now has looked like this there's a recommended amount of fertilizer per unit area and farmers apply it evenly across a field. but there are differences in soil composition and quality even with a small field they can vary a lot we can analyze the composition quite quickly and cheaply using airborne systems such as tiny helicopters and then the dosage can be adjusted meter by meter only applying as much as is really n...

His handgun at this store, guns galore in killeen, texas on march 1, he purchased one what source calls a large amount of ammo. cnn has learned the 34-year-old returned to the store repeatedly to buy even more bullets. it's the same place where major nidal hasan bought the weapon he used in the 2009 ft. hood attack. the army said it now thinks the shootings started as a dispute with another soldier. >> we believe that the immediate precipitating factor was more likely an escalating argument in his unit area. >> reporter: cnn learned that lopez went to a base personnel building wednesday to pic...

Ft. hood had a different statement. >> we me of that the immediate precipitating factor was more likely of ans indicated argument in the unit area, but we're still conducting that investigation. >> reporter: what we do know about the details about this verbal at indication, that ivan lopez came to this base sometime on wednesday afternoon asking for a leave request form. when he was told to come back a day later, that's when things unraveled. there's still no clear motive here, army officials are telling us that altercation is germane to their investigation. >> nick, you talked to some there, ...

A leave request form. cnn has learned in the weeks before his deadly rampage at ft. hood, army specialist ivan lopez was creating a stockpile of ammunition. sources say when lopez bought his handgun at this store, guns galore in killeen, texas on march 1, he purchased one what source calls a large amount of ammo. cnn has learned the 34-year-old returned to the store repeatedly to buy even more bullets. it's the same place where major nidal hasan bought the weapon he used in the 2009 ft. hood attack. the army said it now thinks the shootings started as a dispute with another soldier. >> we beli...